This will probably get me shot. Once upon a time I worked with a bunch of old time cowboys. This is what they took for emergency rations when they had to go out alone on short notice: one small can of fruit cocktail per day (for the sugar - eat it at noon), one or two 303 cans of beans as desired (most took one per day - for the protein), a huge box of saltines (nibble as needed - for salt and carbs), your favorite water purification kit. It's not cooking, I understand that, but it's an interesting example of quick and easy food for hard men doing hard work in bad places.