Here are 15 items that the Amish user that would be worth looking into for SHTF survivial in the long run. Good tips for use even today. It is on Youtube and you have to click the Youtube watch on at bottom of video.
1) Canning Supplies 2) Wood Stove 3) Rainwater Collection System 4) Solar Powered Battery Bank 5) Water Filtration System 6) Root Cellar 7) Oil Lamps & Lanterns 8) Heirloom Seeds 9) Herbal Remedies 10) Hand Tools 11) Gardening Tools 12) Hunting Rifles 13) Quilts 14) Cast Iron Cookware 15) Greenhouse
No one of these is more important than the other, you will need the tools and the knowledge to survive. A rifle that is not taken care and you don't know how to use is just an expensive club. A wood stove without a good chimney and dry wood is just a shelf. My hobby is the green house and hydroponics. For the most part off grid and I raise tomatoes and veggies and try to keep enough supplies for several years. Buy a 40 pound bag of fertilizer instead of a 5 pound one. Usually less than 4 times the cost. Plastic bucket in cool dry place and probably good for a hundred years or the life of the bucket. Has to be water tight as a lot of the fertilizers will pull moisture from the air. Have a shallow well and a hand pump for green house, so that takes care of water also.