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Before huge multinational corporations did it for us, humans had to figure out how to turn raw, unrefined formerly-living things into food that could be cooked or eaten. This is how it will be like if SHTF. Most of us have no idea where all of our food comes from, thats the scary thing.
This is a great article that goes over how to prepare and preserve your own foods from scratch just as we did thousands of years ago, see the full article below: