There’s a whole book on the subject of alternative ways of preserving your survival gardening harvest. Explore lacto-fermentation and more in Preserving Food Without Freezing or Canning, by The Gardeners and Farmers of Centre Terre Vivante. It includes forwards by Deborah Madison and Eliot Coleman.
Whether you’re anticipating the day we might not have ready access to electricity and refrigeration, or whether you simply want to try other ways to preserve your food now, get Preserving Food Without Freezing or Canning. Click on the title of the book in this post to be taken to the page where it’s featured. There you’ll find more info and can place your order.