I've been carrying canned food and bottled water in the back of my truck without any problems. Temps here range from 0* F. to about 110* F. It is parked inside at night though. I just broke down and bought a case of MRE's so when they arrive the cans will probably be replaced.

Sterno is about perfect for a car kit unless you need to boil something. Even then it will do the job, it just takes awhile. No big deal if you are using it for heat anyway. I keep 4 large cans in the truck. I also pack a single burner white gas Coleman stove, but I wouldn't feel unequipped if all I had was Sterno.

Regards, Vince