Household planning tool

Emergency water calculator

Estimate a practical starting supply. The CDC baseline is at least one gallon per person per day.

People in your household Days to prepare for Dogs or cats Add a 20% household buffer

Plan for more when needed. Pregnancy, illness, medical needs, physical activity, and hot weather can increase water requirements.

Optional next step

Need another water-preparedness option?

Review official guidance and a clearly labeled commercial option before deciding what fits your household.