Another thing to add here. For those of you like me who have a well and don't want to waste gasoline to run a generator to get water, don't be caught in a prolonged situation without one of these.
Bison Hand Water Pumps
Flojak Hand Well Pump - Backup Hand Pump for Well
It would be such a shame to have all that nice, fresh water and no way to get it. I would lean toward water being about the most important thing to have and yet one of the first things that people are going to run out of.