Supply calculator

Assumptions you can inspect

Baseline stored water = people × days × 1 US gallon (3.785 liters). This is a minimum planning baseline for drinking and other basic uses, not a complete supply for normal showers or laundry. Drinking-only illustration = people × days × 0.5 gallon; it is part of, not additional to, the total. Needs vary with heat, activity, pregnancy, illness, diet, and pets. Store more where appropriate.

Food output uses person-days and an optional three-meal planning convention, not a calorie prescription. Match actual calories, allergies, infant feeding, and preparation needs to your household. A package serving is not necessarily a full meal.