Matzah and honey. Shelf life of 1,000 years. You can buy a case of Matzah after Passover for $10 and you will never go hungry.
Throw in some sealed oats and peanut butter and you can and infinite food supply.
Water is the bigger problem.
How much/many is in a case of matzah? I've never heard of it before. It just seems like an easy to make cracker from the quick snippet of reading I just did on it.