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Module 1 of 6
Water is the most fundamental of human needs after air itself. The body is largely water, depends on a continuous supply of it, and fails quickly without it — a person can survive weeks without food but only days without water, and dehydration degrades health, function, and judgment within hours. This physiological urgency makes water the first priority of any preparedness or resilience effort, the resource whose shortfall becomes dangerous fastest and whose security matters most. And yet water is also the resource most taken for granted, because for most people the tap has always run — clean water arriving continuously, invisibly, effortlessly, so that its source, its purification, and its vulnerability are never thought about. This course addresses that gap: the procurement and purification of water, so that a household can secure this most fundamental resource against interruption of the normal supply.
This opening module builds the foundation of water security: understanding how much water a household needs, and how to calculate and plan its water storage accordingly. As with food security, sound water security begins with understanding needs — how much water the body and household require, for what purposes, over what period — because everything downstream (how much to store, how much to procure, how to plan the water supply) flows from an accurate understanding of the requirement. A household that plans its water security without understanding its water needs is planning blind, and may store far too little (a dangerous shortfall in the most critical resource) or plan poorly. So this module begins where water security must begin: with understanding and calculating water requirements.
We proceed from the body's water needs outward: first the physiological urgency of water (why it is the first priority), then the household's water requirements (how much, for what purposes), then the calculation of water storage (translating requirements into a storage plan), then the practicalities of water storage, and finally the integration of water requirements into a water-security plan. Throughout, the theme is that water is the first and most urgent priority of resilience, and that securing it begins with understanding and planning for the genuine requirement.
The foundation of water security is understanding why water comes first — why it is the most urgent priority of any resilience effort, more urgent even than food. This understanding is what gives water security its due priority, ensuring it is not neglected in favor of more visible or interesting preparations, because water's physiological urgency makes its security genuinely the first thing a household should secure.
The primacy of water rests on physiology. The human body is largely composed of water and depends on a continuous supply of it for virtually every function — water is essential to circulation, temperature regulation, the functioning of cells and organs, the elimination of wastes, and countless other processes. The body continuously loses water (through breathing, perspiration, and elimination) and must continuously replace it, and when it cannot — when water intake falls short of loss — dehydration sets in, with consequences that escalate quickly and dangerously. Mild dehydration impairs function, energy, and cognition; more severe dehydration causes serious physical distress and impairs health and judgment significantly; and severe dehydration is life-threatening. Critically, this progression is fast — dehydration becomes dangerous within days (far faster than starvation, which takes weeks), and in harsh conditions (heat, exertion) even faster. This physiological urgency — that the body needs water continuously, loses it continuously, and suffers dangerous dehydration within days without it — is what makes water the most urgent of needs, more urgent than food.
The comparison with food sharpens the point. A person can survive a remarkably long time without food — weeks — because the body has substantial energy reserves to draw on. But a person can survive only a short time without water — days — because the body has no comparable water reserve and depends on continuous replacement. This means that in any situation of interrupted supply, water becomes critical far sooner than food — a household could endure a considerable period with inadequate food, but a shortfall of water becomes dangerous within days. This is why water is the first priority: in the timeline of a supply interruption, water is the resource that becomes critical first and fastest, so it is the resource that must be secured first and most surely. A household that has stored abundant food but neglected water has misallocated its preparation dangerously, because the water shortfall will become life-threatening long before the food matters — a critical error that understanding water's primacy prevents.
This primacy has a direct practical implication: water security must be a first priority, secured before or alongside other preparations, not neglected in favor of more visible ones. Because water becomes critical fastest, and because its shortfall is so quickly dangerous, a household's resilience efforts should prioritize water security — ensuring an adequate, secure water supply — as a first and non-negotiable priority. This is sometimes underappreciated, because water security is less visible and less interesting than some other preparations (food stores, gear), and because the ever-running tap makes water easy to take for granted; but the physiology is unforgiving, and a household serious about resilience secures its water first. Understanding water's primacy — its physiological urgency, its criticality faster than food, its unforgiving nature — is what gives water security its due priority, ensuring the household secures this most fundamental resource first rather than neglecting it. This primacy is the foundation of the whole course: water comes first, and securing it — understanding its requirements, procuring it, purifying it — is the most urgent priority of resilience, which this course addresses.
Key Insight: Water comes first — it is the most urgent priority of resilience, more urgent than food. Physiologically, the body needs water continuously, loses it continuously, and suffers dehydration within days without it, escalating quickly to life-threatening (far faster than starvation, which takes weeks). In any supply interruption, water becomes critical far sooner than food, so a household with abundant food but neglected water has misallocated dangerously. Water security must therefore be a first, non-negotiable priority — often underappreciated because the ever-running tap makes water easy to take for granted, but unforgiving in its physiology. Understanding this primacy ensures water security gets its due priority.
With water's primacy established, the foundation of water planning is understanding the household's water requirements — how much water is needed, for what purposes — because this requirement is the basis of all water-security planning (how much to store, procure, and secure). Water requirements span several categories with different quantities and priorities, and understanding them is essential to planning water security accurately.
Household water requirements span several purposes. Drinking water is the most critical and most urgent requirement — the water the body needs to drink to stay hydrated, the requirement whose shortfall causes the dangerous dehydration of Section 1. This is the highest-priority water requirement, the one that must be met to sustain life and health, and it is the core of water-security planning. The quantity of drinking water a person needs per day varies (with body size, activity, climate, and health — needs rise significantly with heat and exertion), but there is a general baseline requirement for drinking that planning must meet, and this drinking requirement is the non-negotiable core of water security. Water for food preparation — needed to prepare and cook food (especially the stored dry foods that require water to prepare) — is another important requirement, connecting water security to food security (stored dry foods need water to prepare, so water is needed to use the food store). Hygiene and sanitation water — needed for washing, cleaning, and sanitation — is a further requirement, important for health (hygiene prevents illness, especially important in a disruption) though of larger quantity and somewhat lower immediate priority than drinking. And other requirements (for any specific household needs) round out the picture. Understanding these categories — drinking (most critical), food preparation, hygiene and sanitation, and other needs — and their quantities and priorities is the basis of water requirement planning.
A key principle, echoing the food-security course's quality-tiering, is the prioritization of water requirements by criticality. Not all water requirements are equally critical or urgent: drinking water is the most critical (its shortfall causes dangerous dehydration fastest) and must be secured first and most surely; food preparation water is important (needed to use the food store); hygiene and sanitation water is important for health but of somewhat lower immediate urgency (and can be reduced or managed in scarcity); and requirements can be prioritized accordingly. This prioritization matters for planning, especially for scarcity: in a situation of limited water, the household prioritizes drinking water (the critical, life-sustaining requirement) above the less-critical requirements (reducing hygiene water use, for instance, to preserve drinking water), so that the most critical requirement is met even when total water is limited. Understanding this prioritization — drinking first and most surely, then food preparation, then hygiene and sanitation, with the capacity to reduce the less-critical in scarcity — is important for both planning (ensuring the critical drinking requirement is securely met) and management (prioritizing the critical requirement in scarcity).
The general principle for planning quantities is to establish a per-person, per-day water requirement across the categories, which becomes the basis for calculating storage and supply. A common planning approach establishes a total per-person, per-day water figure that covers the requirements (drinking, food preparation, basic hygiene) at a reasonable level — a planning figure that, multiplied by the number of people and days, gives the total water requirement to plan for. This planning figure should be adequate (meeting the genuine requirements, not too little — an under-estimate in the critical resource is dangerous) and should account for the factors that raise needs (particularly heat and exertion, which raise drinking needs significantly, so planning for a hot climate or an active scenario requires a higher figure). Establishing an adequate per-person, per-day water requirement — covering the categories at a reasonable level, accounting for the factors that raise needs — is the quantitative foundation of water planning, the figure from which storage and supply are calculated. A household that establishes an accurate, adequate water requirement figure has the foundation for planning its water security; one that under-estimates the requirement plans a dangerous shortfall in the most critical resource. So understanding water requirements — the categories, their prioritization, and an adequate per-person per-day figure accounting for the factors that raise needs — is the essential foundation of water-security planning.
Key Insight: Water requirements span drinking (the most critical and urgent — the life-sustaining core of water security), food preparation (needed to use the food store, especially dry stored foods), hygiene and sanitation (important for health, larger quantity, somewhat lower immediate urgency), and other needs. Requirements are prioritized by criticality — drinking first and most surely, with less-critical uses (hygiene) reducible in scarcity — important for both planning and scarcity management. Planning establishes an adequate per-person, per-day water figure covering the categories, accounting for factors that raise needs (heat and exertion raise drinking needs significantly). An accurate, adequate requirement figure is the quantitative foundation; under-estimating plans a dangerous shortfall in the most critical resource.
With the water requirement understood, the household can calculate its water storage — translating the requirement into a plan for how much water to store, for what period. This calculation is the practical bridge from understanding water needs to actually planning a water reserve, and it is the core of water-storage planning.
The calculation of water storage follows straightforwardly from the requirement and the planned duration. The household's per-person, per-day water requirement (Section 2), multiplied by the number of people and the number of days the storage is to cover, gives the total volume of water to store. This is the fundamental water-storage calculation: (per-person daily requirement) × (number of people) × (number of days) = total storage volume. For example, planning to store water for a household of a given size for a given number of days requires storing the daily requirement times the people times the days — a volume that the calculation makes concrete. This calculation translates the abstract requirement into a concrete storage target: the specific volume of water the household needs to store to meet its requirements for the planned period. Getting this calculation right — using an adequate requirement figure and a sensible planned duration — gives the household an accurate water-storage target, the volume it needs to store.
The planned duration — how many days of water to store — is a key planning decision, analogous to the tiered planning of the preparedness course. How much water to store depends on how long an interruption of normal supply the household plans for: a short interruption requires storing only a few days of water; a longer interruption requires storing more; and the deepest planning (for extended interruptions) requires either very large storage or, more practically, the procurement and purification capability that the rest of the course addresses (because storing very large volumes of water for extended periods is impractical, given water's weight and bulk). So the planned duration shapes the storage calculation, and it connects to the broader water-security strategy: storage covers the shorter-term requirement (a manageable volume of stored water for a few days to some weeks), while procurement and purification (the rest of the course) address the longer-term requirement (obtaining and purifying water when stored water runs out, for extended interruptions). This mirrors the food-security and off-grid courses' storage-to-systems progression: stored water for the shorter term, procurement-and-purification capability for the longer term. The household calculates its storage for the duration it plans to cover with storage, and relies on procurement and purification for durations beyond that.
The practical limits of water storage shape this planning significantly, and understanding them is important. Water is heavy and bulky — a volume of water weighs a great deal and takes significant space — so storing large volumes is physically demanding (heavy, space-consuming) and has practical limits. This means that while storing water for the shorter term is practical (a manageable volume for a few days to some weeks), storing water for the very long term (extended interruptions) becomes impractical (the volume required is too heavy and bulky to store practically). This practical limit is why water security, for anything beyond the shorter term, relies on procurement and purification (obtaining and purifying water) rather than storage alone — because storing enough water for a long interruption is impractical, the household must be able to obtain and purify water when its stored water runs out. So the storage calculation is bounded by practicality: the household stores a practical volume for the shorter term (calculated from its requirement and a sensible planned duration), and relies on procurement and purification for the longer term. Understanding this — that storage is practical for the shorter term but bounded by water's weight and bulk, so that longer-term water security requires procurement and purification — frames the storage calculation and connects it to the rest of the course.
The synthesis is that calculating water storage translates the requirement into a concrete storage target for the planned duration, bounded by the practical limits of storage. The household calculates its storage (requirement × people × days) for the duration it plans to cover with storage, stores that practical volume, and relies on procurement and purification for longer durations beyond what storage can practically cover. This calculation gives the household a concrete, accurate water-storage plan — how much water to store, for how long — grounded in its genuine requirement and bounded by practicality. A household that calculates its water storage this way has a concrete, adequate storage target and understands where storage gives way to procurement; one that stores water without this calculation may store too little (a dangerous shortfall) or plan poorly. So calculating water storage — translating the requirement into a concrete storage target for a sensible duration, bounded by practicality, and connected to procurement for the longer term — is the practical core of water-storage planning, the bridge from understanding requirements to actually planning a water reserve.
Key Insight: Calculating water storage translates the requirement into a concrete target: (per-person daily requirement) × (people) × (days) = total storage volume. The planned duration is a key decision — storage covers the shorter term (a manageable volume for days to weeks), while procurement and purification (the rest of the course) address longer interruptions, because water's weight and bulk make storing very large volumes impractical. This mirrors the storage-to-systems progression: stored water for the shorter term, procurement-and-purification capability for the longer term. The calculation gives a concrete, adequate storage target bounded by practicality — connecting storage (shorter term) to procurement (longer term) for complete water security.
Having calculated how much water to store, the household must store it safely and practically — in appropriate containers, under appropriate conditions, maintaining its safety and usability over time. Water storage has its own practical requirements and considerations, and understanding them ensures the stored water remains safe and usable when needed. This section examines the practicalities of water storage.
Containers for water storage must be appropriate — safe for storing water (made of materials safe for potable water, not materials that could contaminate the water), durable, appropriately sized, and sealable (to protect the water from contamination). Water-storage containers range from smaller containers (jugs, bottles) to larger containers (barrels, tanks) suited to storing larger volumes, and the household chooses containers appropriate to its storage volume and situation — smaller containers for smaller volumes or portability, larger containers for larger volumes. The key requirements are that the containers be safe for potable water (not contaminating it), durable and sealable (protecting the water), and appropriate to the volume and situation. Using appropriate, potable-safe, sealable containers is the foundation of safe water storage.
Water quality in storage requires attention, because stored water can degrade or become contaminated over time if not properly handled. Water stored properly (clean water, in clean sealed containers, in good conditions) can keep for extended periods, but water can degrade or become contaminated if handled poorly (contaminated water stored, or contamination entering the storage, or conditions allowing growth of organisms). To maintain water quality in storage, the water should be clean when stored (safe, potable water stored — or water treated before storage), stored in clean, sealed containers (preventing contamination entering), kept in good conditions (cool, dark, and stable conditions help maintain quality — heat and light can degrade stored water and promote growth of organisms), and managed over time (rotated or treated as appropriate to maintain quality). Some approaches treat stored water (with appropriate treatment) to help maintain its quality during storage. Attending to water quality in storage — storing clean water in clean sealed containers in good conditions, managed over time — ensures the stored water remains safe and usable when needed, rather than degrading into unsafe or unusable water.
Storage conditions and location matter for water storage, as for food storage. Water is best stored in cool, dark, stable conditions (cool and dark help maintain quality and inhibit growth of organisms; stable conditions avoid problems), protected from contamination and from freezing (which can damage containers) or excessive heat. The household stores its water in appropriate conditions and locations — cool, dark, stable, protected — to maintain its quality and safety. And because water is heavy, the storage location must be able to bear the weight of the stored water (a significant consideration for larger volumes), and the water should be stored where it is accessible and usable. Choosing appropriate storage conditions and locations — cool, dark, stable, protected, weight-bearing, accessible — supports the safe, practical storage of the household's water.
Rotation and management of stored water, echoing the food-security course, keep the stored water fresh and usable over time. Stored water, though it can keep for extended periods when properly stored, benefits from rotation (periodically using and replacing the stored water) to keep it fresh, and from management (checking the stored water, maintaining the containers and conditions, treating or replacing as needed) to maintain its quality over time. This keeps the water store fresh and usable, avoiding the degradation that neglected stored water can suffer. As with food, the stored water is best treated as a living store, managed and rotated to stay fresh, rather than a static store set aside and forgotten (which can degrade). Managing and rotating the stored water — keeping it fresh through periodic use and replacement, maintaining its quality through checking and maintenance — ensures the water store remains safe, fresh, and usable when needed. Together, these practicalities — appropriate potable-safe sealable containers, attention to water quality in storage, appropriate cool/dark/stable/protected/weight-bearing storage conditions and locations, and rotation and management — ensure the household's calculated water storage is stored safely and practically, remaining safe and usable when needed. A household that stores its water this way has a safe, usable water reserve; one that stores water poorly (in inappropriate containers, in poor conditions, unmanaged) may find its stored water degraded, contaminated, or unusable when needed.
Key Insight: Storing water safely and practically requires: appropriate containers (safe for potable water, durable, sealable, sized to the volume); attention to water quality in storage (store clean water in clean sealed containers, kept cool/dark/stable, managed over time, since stored water can degrade or become contaminated); appropriate conditions and location (cool, dark, stable, protected, weight-bearing — water is heavy — and accessible); and rotation and management (periodically using and replacing to keep it fresh, maintaining quality through checking and maintenance — a living store, not a static forgotten one). Storing water this way keeps the calculated reserve safe and usable when needed; storing it poorly risks degraded, contaminated, or unusable water.
Water requirements and planning vary with different needs and circumstances — different household compositions, climates, activities, and situations change water needs, and understanding this variation lets a household plan water security accurately for its actual situation rather than a generic average. This section examines how water needs vary and how planning accommodates the variation, personalizing water security to the household's actual circumstances.
Household composition affects water needs. Different household members have different water needs — larger people, active people, and others may need more; and certain members have special needs (infants and young children have specific water needs; pregnant and nursing members have elevated needs; ill members may have particular needs; and members with medical conditions may have specific water requirements). A household's total water need is the sum of its actual members' needs, which vary by their sizes, ages, activities, and any special needs, so accurate planning accounts for the actual household composition. Particularly, any members with special or medical water needs (infants, ill members, and others) must be planned for specifically, because their needs may be critical and specific. Personalizing the water plan to the actual household composition — accounting for the members' varying and special needs — is important for accurate water planning.
Climate and environment affect water needs significantly, particularly through heat. Hot climates and hot conditions raise water needs substantially — heat increases the body's water loss (through perspiration) and therefore its drinking needs, so water needs in hot conditions can be significantly higher than in temperate ones. This is a critical planning factor: a household in a hot climate, or planning for a hot-weather scenario, must plan for significantly higher water needs than a temperate baseline, because the heat raises drinking needs substantially, and under-planning for a hot climate could leave a dangerous shortfall. Cold climates have their own considerations (water can freeze, requiring management). Dry climates raise the importance of water security (water may be scarcer). So climate and environment — heat especially — significantly affect water needs and planning, and accurate planning accounts for the household's actual climate, planning for higher needs in hot conditions.
Activity level affects water needs, echoing its effect on caloric needs (food-security course). Physical activity and exertion raise water needs substantially — exertion increases water loss (through perspiration and respiration) and therefore drinking needs, so an active scenario (one involving significant physical labor or exertion, as a disruption might) raises water needs above a sedentary baseline. This is another critical planning factor: a scenario involving increased physical activity (manual labor, physical tasks that normal life does not require) raises water needs, potentially substantially, so planning for such a scenario must account for the higher water needs that activity creates. Under-planning for an active scenario — planning sedentary-level water for an active situation — could leave a dangerous shortfall, so planning accounts for the activity level of the anticipated situation. The combination of heat and exertion (a hot, active scenario) raises water needs especially significantly, and planning for such conditions requires a substantially higher water figure.
The principle across these variations is that water planning must be personalized to the household's actual needs and circumstances — its composition, climate, activity, and situation — rather than based on a generic average, because the actual needs vary significantly with these factors, and accurate planning (especially for the critical resource of water) requires accounting for them. A household planning water security assesses its actual water needs — accounting for its members' varying and special needs, its climate (especially heat), its anticipated activity level, and its situation — and plans its water storage and security accordingly, for its genuine needs rather than a generic figure. This personalization is especially important for water because water is so critical (its shortfall so quickly dangerous) and its needs so variable (with heat and activity especially), so that a generic plan could significantly under-provide for a household in hot conditions, an active scenario, or with special-needs members. Personalizing the water plan to the actual needs and circumstances — accounting for composition, climate, activity, and situation — ensures the household plans adequately for its genuine water needs, which is essential for the critical resource of water. A household that personalizes its water planning has an accurate, adequate plan for its actual needs; one that uses a generic figure may dangerously under-provide for its actual, variable needs.
Key Insight: Water needs vary significantly with circumstances, so planning must be personalized, not generic. Household composition matters (members' varying needs, and special/medical needs of infants, ill, pregnant/nursing members — planned for specifically). Climate matters greatly — heat raises drinking needs substantially (through perspiration), so hot climates or scenarios require significantly higher planning figures, and under-planning risks a dangerous shortfall. Activity level matters — exertion raises water needs substantially, so active scenarios require higher figures (heat + exertion especially so). Because water is so critical and its needs so variable, personalizing the plan to actual composition, climate, activity, and situation is essential — a generic figure could dangerously under-provide.
We close by assembling the elements into the complete foundation of water-requirement planning, and by drawing out the theme that has governed throughout: that water is the first priority of resilience, and that securing it begins with understanding and planning for the genuine requirement.
The complete water-requirement foundation integrates all the module's elements: the understanding of water's primacy (Section 1) that gives water security its due priority; the understanding of water requirements (Section 2) — the categories, their prioritization, and an adequate per-person per-day figure; the calculation of water storage (Section 3) that translates the requirement into a concrete storage target bounded by practicality and connected to procurement; the practicalities of water storage (Section 4) that store the water safely and usably; and the personalization (Section 5) that plans for the household's actual, variable needs. Together, these constitute the complete foundation of water-requirement planning — understanding how much water the household genuinely needs, and planning its water storage (and the procurement that extends it) accordingly. This foundation is what the rest of the course builds upon: the procurement (obtaining water) and purification (making it safe) that the coming modules address serve to meet the water requirement this module has established, for durations beyond what storage can practically cover.
The governing theme, reiterated throughout, is that water is the first priority, and securing it begins with understanding the requirement. Water's physiological primacy — its criticality faster than any other need — makes it the first priority of resilience, and this module has insisted on that priority, ensuring water security is not neglected. And securing water begins, as all sound resilience does, with understanding the genuine requirement — how much water the household needs, for what, over what period, in its actual circumstances — because everything downstream (storage, procurement, purification) serves to meet that requirement, and planning without understanding it is planning blind. So the complete water-requirement foundation embodies the two governing principles: water first (its primacy), and requirement-based planning (understanding the need). A household that grasps these — securing water as a first priority, and planning it around the genuine, personalized requirement — has the foundation of genuine water security; one that neglects water's priority, or plans without understanding its requirement, has a dangerous gap in its most critical resource.
This water-requirement foundation connects water security to the broader resilience the surrounding curriculum develops. Water, as the first and most critical need, is a foundation of resilience — a household that has secured its water has secured its most urgent need, while one that has neglected water has a critical vulnerability regardless of its other preparations. And the requirement-based, personalized, practical planning this module has built echoes the sound-planning approach that runs through the curriculum (assess needs, plan accordingly, personalize to circumstances, bound by practicality). So the water-requirement foundation is both the specific foundation of water security and an instance of the sound resilience planning the curriculum develops, applied to the most critical resource. Building this foundation — understanding water's primacy, planning around the genuine personalized requirement, calculating practical storage connected to procurement — is the essential first step of water security, and it is the foundation on which the procurement, purification, testing, redundancy, and crisis-water dimensions of the coming modules build. Securing water, the first priority, begins here, with understanding and planning for the requirement.
Trace the complete foundation through a household planning its water security. Understanding that water is the first priority — critical faster than any other need — it prioritized water security. It understood its water requirements — drinking (the critical core), food preparation, hygiene and sanitation — and established an adequate per-person per-day figure, prioritizing drinking. It personalized the figure to its circumstances — accounting for its members (including a young child's needs), its warm climate (planning for the higher needs heat creates), and its anticipated situation. It calculated its water storage — requirement × people × days — for the duration it planned to cover with storage, storing that practical volume in appropriate potable-safe sealable containers, in cool, dark, stable conditions, managed and rotated to stay fresh. And it understood that storage covers the shorter term, with procurement and purification (the rest of the course) needed for longer interruptions, given water's weight and bulk. This household has built the complete water-requirement foundation: understanding water's primacy, planning around its genuine personalized requirement, storing a practical reserve safely, and connecting to the procurement and purification that extend water security. That is the foundation of genuine water security — water secured as the first priority, planned around the genuine requirement — on which the rest of the course builds.
Key Insight: The complete water-requirement foundation integrates water's primacy, the understanding of requirements (categories, prioritization, adequate per-person figure), the storage calculation (requirement × people × days, bounded by practicality, connected to procurement), the practicalities of safe storage, and personalization to actual needs. The governing theme is that water is the first priority, and securing it begins with understanding the requirement — water's physiological primacy makes it the first priority of resilience, and sound securing begins with the genuine, personalized requirement that everything downstream serves. This foundation — water first, requirement-based planning — is the essential first step of water security, on which procurement, purification, testing, redundancy, and crisis-water build.
This foundational module established the water-requirement foundation of water security: water's primacy as the first priority of resilience; the understanding of water requirements (categories, prioritization, adequate figure); the calculation of water storage (translating requirement to reserve, bounded by practicality); the practicalities of safe water storage; and the personalization to the household's actual, variable needs. The governing lessons are that water is the first priority and that securing it begins with understanding the genuine requirement — the foundation on which the procurement, purification, and broader water security of the course build.
The next module turns to the procurement of water beyond stored supply: identifying water sources. Because storage is practical only for the shorter term (water's weight and bulk limiting long-term storage), longer-term water security requires obtaining water from available sources — and identifying those sources is the first step of water procurement. Module 2 will examine the water sources a household might obtain water from, their characteristics, availability, and safety, building on the requirement foundation to identify where the needed water can be obtained. From there the course proceeds through purification methods, water testing, redundant water systems, and water in crisis scenarios — together building the complete architecture of water procurement and purification.