I usually eat canned stuff, and some sort of meat and veggie that I pick up at a local place along the way.
I usually heat the canned stuff right in the can and my preferred way to cook a steak is to toss it right on the coals. It cooks the outside really quick and leaves the inside nice and rare... Just perfect!
... Of course, if you're in bear country, this isn't a great way to do it!