I have toured with and without a stove. On the "without" trips (usually in places with great local cuisine), I can find myself far from a restaurant at least once so I carry some "iron rations" for emergency use. You need something which stores well and is not damaged by squishing. A can of sardines in oil and some pumperknickle bread will get you through a night without you going into calorie deficit. I'm sure there are parts of a military MRE that will work. You could survive on trail mix or other snacks but I prefer a more meal-like ration.
Some people carry a minimal cook system for Just Add Water foods, basically a metal cup and alcohol or solid fuel stove. Using firewood is often not permitted but if you do, then you need a tiny fire made from small sticks.
Cooking in bear country is another tale.