I have a fair amount of shtf supplies. preserved food, means to purify large amounts of water without electricity, personal protection, it goes on. I'm thankfully not at square one, but there are some shortfalls I do need to address
Consider looking into a freeze dryer, you can store meat and food for 20+years. If you live on a land with a decent number of trees, look into wood gasification to run engines and generators.
I have a freeze dryer. About half my garden goes into it every year
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