A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
-Robert A. Heinlein
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Preparation > SolarCooker

Solar Cooker

While there are some security risks involved, being able to cook a meal or boil water without using any fuel would be a valuable asset.

You can buy commercial Solar ovens


Keep in mind you have to be aware of your situation. If you are the only one cooking chili when everyone is going hungry, you are going to have people investigating. You don't want to let people know you have food when they don't.


https://www.youtube.com/watch?v=cLCBQscnSdU

rosered's try - didn't work with tinfoil
https://www.youtube.com/watch?v=J1sS9NtmKzo