Check out this cool design. These HOTCANS have been around for quite some time, used by both the british forces, and those hopeless at cooking, heres how it works: "Inside is a can of food surrounded by an outer can and in the space between the two cans is a water sachet and granular limestone...When you insert the spike into the three holes in the top rim o the can this pierces the water sachet, the water then flows into the limestone and a natural reaction occurs between the limestone and water which produces heat. This warms up the food inside the can and within 8-12 minutes it will be a perfect eating temperature of 60-70 degrees Celsius. "
This isn't exactly as sustainable as a stove or campfire, but it has something to it that just makes you think "survival."
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