Food is one of those things discussed in depth on the ATS survival forums. We never have come to an agreement on the best way to go. its a very
personal issue. You can never go wrong with fruit cake, and in a pinch you can build a house out of it.
Seriously tho check it this site.
Long Term food knowledge
There are other ways to go but MRE is what I baleav in. they served me well in the military and there a proven system.