When I started out with concern about emergency supplies, I made a little stove out of a large tin can and stocked up on Sterno cans. Later, I got a two-burner camp stove and stocked up on Bernz LPG torch tanks, but I still have the homemade can stove and Sterno burners. But let's face it, if tummy growls turn to HUNGER pains, eating cold stuff is OK.
I remember a line from a movie: "Ma'am, if you're really hungry, and I don't mean just ready for dinner, you'll eat dog and fight over the bones."
And don't forget candles and batteries.