Water — Track 1: Planning
Dry food storage is common preparedness advice. The water required to actually prepare that food is almost never calculated alongside it. Dried beans need 1.5–2 gallons per pound to prepare. White rice needs about a quart per cup dry. This page closes that planning gap.
The planning gap
The standard preparedness model addresses water storage and food storage as separate systems. You calculate how much water to drink per person per day, then separately figure out what food to store. The two plans rarely intersect — which means almost every household has a mismatch between their food supply and the water needed to prepare it.
A 14-day supply of dried beans and rice for a family of four looks substantial. At typical emergency water allocation (1.5 gallons per person per day), that family has 84 gallons stored for two weeks. But if they want to actually cook those dried beans and rice, they need another 20–30 gallons on top of that — water that isn't in most standard calculations.
The solution isn't to store more water indefinitely. It's to plan water and food storage together, matching the cooking water requirements of your specific food supply to your stored water. Or to choose foods that require less water to prepare.
Two strategies
Strategy 1: Account for cooking water
Add the water needed to prepare your stored food to your total water storage target. If your food plan includes dried beans and grains, your water plan must include the cooking water for those foods.
Best for households with space for more water storage and a plan to cook from scratch.
Strategy 2: Choose water-efficient foods
Build your food supply around items that require little or no preparation water — canned goods, crackers, peanut butter, instant foods, freeze-dried meals. Match the water demand of your food to the water you have available.
Best for water-constrained situations (apartments, limited storage) or shorter duration preparedness.
The reference table
These figures are for preparation water only — not drinking water. They represent the water needed to soak (where applicable), cook, and rinse the cookware used for each food type.
Preparation water figures only. Does not include cookware cleaning water (~0.25–0.5 gal per cooking session) or drinking water. Cooking times affect fuel consumption significantly — see cooking fuel section below.
The fuel connection
Every time water is brought to a boil or held at a simmer, fuel is consumed. This is the second hidden cost of dry food storage that most plans miss. Dried beans take 1.5–3 hours of simmering to cook. Wheat berries take 45–60 minutes. White rice takes 20 minutes. The fuel math matters.
Cooking time and fuel demand
The pressure cooker advantage
A pressure cooker reduces dried bean cooking time from 2–3 hours to 25–35 minutes — a 70–85% fuel reduction. If your food storage plan includes significant quantities of dried legumes, a pressure cooker (stovetop, not electric) is a meaningful fuel-saving investment. Stovetop pressure cookers work on any heat source including camp stoves and propane burners.
The most water- and fuel-efficient emergency cooking strategy combines foods across the efficiency spectrum:
Days 1–3: Water-zero foods
Canned goods eaten cold, crackers, peanut butter, hard cheese, jerky. No cooking water, no fuel. Preserves stored supplies during the uncertain early phase of any disruption.
Days 3–7: Low-water cooked foods
White rice, pasta, instant oatmeal, freeze-dried meals. Moderate fuel, modest water. Provides hot meals with manageable resource cost.
Day 7+: Full cooking when resources allow
Dried beans, whole grains. High fuel and water cost, but maximum calories per stored pound. Use when situation is stable and fuel/water are confirmed available.
See the Energy section for camp stove selection, propane storage, and cooking fuel planning.
Special water needs
Powdered formula requires specific water volumes — follow your formula label exactly. A typical newborn consuming 24 oz of formula per day requires 24 oz of water for formula preparation, in addition to the caregiver's own water needs.
Water quality for formula is critical: During any disruption, use stored water or properly treated water. During a boil water advisory, boil formula water, let cool to room temperature before use.
Ready-to-feed formula eliminates the water requirement entirely. More expensive but removes the water and safety calculation from the equation — a significant advantage during water disruptions with infants in the household.
Liquid medications prepared with water (suspensions, reconstituted antibiotics) use treated water. Many medications are taken with 8 oz of water. Medications that require refrigeration may need ice or a cooler during extended outages — which affects the water and ice budget if you're using ice cooling.
Some medications interact with water quality — fluoride content, mineral content, and pH can affect absorption of certain drugs. If a family member is on medications with specific water requirements, identify this in advance and store appropriate water.
Gluten-free diets often rely more heavily on rice, potatoes, and corn-based foods — generally moderate water users. Vegetarian and vegan diets that depend on dried legumes for protein are water-intensive from a cooking standpoint; this should be explicitly accounted for.
Low-sodium diets may require rinsing canned foods before eating, adding a small water cost. High-sodium diets increase thirst and therefore drinking water demand. Planning for dietary needs specifically — not just "standard household" — produces a more accurate water requirement.
One integrated plan
This is a one-time planning exercise. Walk your food storage, categorize it, and add the water costs to your total storage target.
List your stored food by category. Separate into: needs no water (canned, crackers, ready-to-eat), needs small amount (freeze-dried, instant), and needs significant water (dried beans, grains).
Estimate meals per category. How many servings does your stored food provide? How many of those servings are from each category?
Calculate cooking water. Use the table above. Multiply the cooking water per serving by your estimated serving count for each food type. Add these together.
Add to your drinking water target. Your total water storage target = drinking and hygiene water + cooking water for your specific food supply. Most households find the cooking water adds 20–40% to their baseline estimate.
Adjust your food or water plan. If the total is more than you can realistically store, shift your food plan toward lower-water options. If you have storage capacity, build out toward the full target.
Example: Family of 4, 14-day plan
vs. the standard 1 gal/person/day calculation of 56 gallons — a 95–100% gap. This is why food and water storage must be planned together.
Run the full household calculator — people, pets, climate, cooking water, and hygiene — and get your actual target.
Calculator →
Complete the system
Container types, placement, rotation schedule, and the common mistakes that leave households short when they need water most.
Storage guide →
Emergency conservation mode — how to reduce cooking and cleaning water use when supplies are limited. Paper plates and the three-basin method save significant water in a food preparation scenario.
Conservation guide →
Camp stove selection, propane storage, and how to plan cooking fuel alongside water and food for a complete extended-outage cooking capability.
Energy section →