Food was always one of our most challenging tasks each day. We tried to eat a warm meal at least once a day. To do that, we had a small "pocket rocket" type stove, a small gas canister, and some titanium cookware. The stove and gas were cheap <$20 combined. Titanium is pricy, but aluminum or stainless works just as well. Our favorite breakfast was quick oats, sometimes with peanut butter, sometimes fruits. For dinner we had instant ramen, with added veggies like canned corn. There are all sorts of canned foods too, just be careful of the sodium.