One gallon Per Person Per day -1g/p/d is enough to get by; a few quarts to drink and one to use for cooking or washing up.
Stock a few cases of bottled water. Twelve 12-oz bottles is just over a gallon of water.
1-gallon or 2.5-gallon containers are more convenient to store, reuse, transport, and they produce less waste than individual bottles of water.
Write the purchase year and month YYYYMM on the container.
Follow the checklist in the Preparation Handbook to help with rotation.
Rotate by taking your oldest water storage when attending outdoor activities like picnics, hiking, and camping.
Test your preparedness by using only stored water for a week.
Replenish as needed.
More information may be found in my Preparation Handbook.