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I know a hunter who goes in to the deep woods to kill animals. I think he was on jre- I forget the name. He was bragging about how he makes bacon/peanut butter/toasted bread sandwiches he eats during his long hikes. I think each sandwich comes out over 2 thousand calories each and it should last a long time.
Other thing you can make is fruit leather. You buy some variety mix frozen berries from costco. Put it into a high grade blender or magic bullet, then blend it till it's fine grade powder. Put it on a wax paper and bake it into a oven. It would turn into gel like substance and after it cools you can roll it up like a burrito. That should give about a thousand calories per stick.
