I typically carry canned foods rather than dehydrated foods in a vehicle since I would only have to used my water stash to prepare the dried stuff. With canned fruits and stews, I am augmenting my water supply, rather than using it up. The empty tins also become potentially useful objects in an emergency(tin can lid signal mirror, anyone?).
The trick is finding food items which can survive any length of time in the rather severe environment of a car. It is generally necessary to recycle fairly often - at least once a year.
In theory, the perfect stove would be one which would run off the car's fuel supply. Then you would not have to keep any kind of fuel canister within the passenger space. Depending upon the specific vehicle, it might be tricky to obtain fuel from the tank. I go with a Trangia cook kit, and a small bottle of alcohol in a sturdy bottle.
_________________________
Geezer in Chief