Assuming you're in reasonable shape and in ideal conditions -- that is, not in the heat or cold and not exerting, a human can probably live for about 3 to 5 days without any water. Healthier humans can live another day or so longer.
In this book we are going to show you how to increase your families chances in finding clean and purifying water in your immediate area. We won’t go into finding and storing water for the long term. But concentrate on maintaining hydration for the short term until other resources can be found. be it FEMA the Red Cross or your own bug out plan.