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Having a way to cook if the SHTF is obviously a given, having a way to cook with less fuel is the smartest thing to have. A rocket stove can boil water and cook food on only a few sticks and twigs. They are super efficient.
You can buy them for around 100 bucks, but why spend that money when you can make your own for a fraction of that cost. See how to build a large rocket stove below
Bonus: How to Make Pemmican, the Original Survival Food
Invented by the natives of North America pemmican was used by Indian scouts as well as early western explorers.
Native Americans spent a great deal of time on the go and depended on having portable, high-energy, highly nutritious, and filling foods that would last for long periods of time without refrigeration.
Pemmican is a portable, long-lasting, high-energy food. It's made of lean, dried meat that's crushed into powder and mixed with hot, rendered fat. This makes it one of the ultimate foods to have stockpiled for when SHTF or disaster strikes.
People really should avert their gaze from the modern survival thinking for just a bit and also look at how folks 150 years ago did it.
These guys were the last generation to practice basic things, for a living, that we call "survival skills" now.