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Buy some MREs. They are made to last and to have everything essential for survival.

Shelf life is about 5 years, depending on how it's stored: https://www.mreinfo.com/mres/mre-shelf-life/

If you're going for shelf life I've eaten canned chili that was more than 15 years old and it was fine. Most things seem to change texture in unpleasant ways sitting in a can that long but chili doesn't. Not that it's viable to live off of in terms of calories and storage space, just an interesting observation about shelf life.

Make sure to pack some fiber though too! They'll plug you up something fierce if you eat them a lot.

Bran is cheap and should last a long time.

For sure. When making my emergency kit (my oldest has severe food allergies and I live in a major earthquake zone), I ran across some issues with things with high fat content though (which I believe bran might be). Unless you’re very careful with removing oxygen, the fat can go rancid after awhile (from months to years depending on the specific oils).

So best to do some research beforehand.

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