Nearly every time I go to the grocery store, I pick up a box of canning lids, alternating between wide and narrow mouth. I think I could extend our supplies to maybe a year and a half. 
I do save seeds but some things I buy hybrid like my fav summer squash or cuke. I’d be doing some experiments with saved seeds for those but in a pinch I could.
I’ve toyed with the idea of having a rooster for my hens and allowing chicks to be born. I already have a steady supply of eggs and goodness knows you can't just get hens out of a batch of chicks. My coop is designed to allow for a rooster in a separate space if needed. I do like my neighbors though. I’ve also considered raising bunnies, but honestly I’d rather just grow beans and squash and continue to eat eggs.
One of the IG folks that I follow has harvested sea salt from their vacations at the beach by bringing some saltwater home. Interesting though seems like salt is pretty cheap! Not sure that pencils out with gas and all that. I keep a deep pantry but yeah, things would run out. I keep two years of canning salt and vinegar on hand. I know I could make vinegar but I rely on the commercial stuff with a known acidity.
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