I was thinking about how long and detailed yesterday's post about water storage was and I worry that it may be a case of giving you too much information, which can sometimes be worse than getting none at all because you get overloaded. And, this is a particular aspect of emergency preparedness and self-sufficient living where you really cannot afford to be lackadaisical.
Above everything else, clean drinking water should be at the very tip-top of your food storage priorities. Afterall, a person could survive for a few weeks without food, but not more than 3 days without water. During an emergency, water is also necessary for washing and hygiene. The following is a much more concise video presentation:
Additionally, FEMA/Red Cross Guidelines can be found here.