Smart! Have some water as well!
We keep about 50 gallons drinking water on hand. Have a swimming pool of 4000 gallons, three rain barrels of 100 gallons, and a well. Filtering systems, and directions for making filters from nature-sand dirt etc.
We get plenty of rain in the spring, so if we save it we have enough for the garden during the dry season, but some we could also filter and drink.
Saving money to buy a manual pump for well.