Coleman makes a neat little one-burner cooker attached to a camping gas cylinder. It comes in quite a small box and could be used for roadside food prep at any time (I actually made an entire meal with one pot and a steamer - steamed the veggies and the fish in tinfoil, worked beautifully). One of those and a good skillet might help (for those juicy steaks in Alberta...).

As for the water (in/out), hope this is not too much, but men are soooo lucky, they can actually get by with a large cup if stuck in a car for long periods of time.

(Or is that too much for ya to wrap your mind around? I've seen my dh do it in a pinch, and I'm always so envious!) Good luck!