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If you can tolerate canned sardines, they're fantastic nutrition. Usually 88 cents a tin, in calorie rich olive oil. Small, with long shelf life. I'll usually do that with a sweet potato, just foil it and stick in fire.
Thats as close to a meal as I ever get while out. It takes forever to bake a tater so I'm usually just on a mix of nuts/seeds/chocolate chips/shredded jerky. The tater helps you poop too, since only seeds and jerky like to form a compressed fuel log inside me.