In a real survival situation, you don’t need to heat the can but can eat it cold. I speak from experience - I was sick at a hotel once with no room service AND no microwave. I went to the drugstore, bought a can of chicken noodle soup and ate it cold. It was a little tough at first to choke down, but it helped me feel a little better.
I’ve eaten cold food from a can several times, and that is my primary plan (and it’s not THAT bad). I also have several options to cook if my car gets stranded, but food temperature is the least of my worries - getting the liquid and the calories inside my body are at the top of my list.