Pressure canner. You need 10psi or more to safely can non acid foods, meats, etc. for storage without need for refrigeration. Nothing like a supply of one's own favorite recipes and harvest from the garden. Spaghetti sauce, salsa, soups, chili -- ideally from meat taken from legally hunted wild game.
Generator. Wood stove or high efficiency fireplace insert. Chainsaw...
Starting fires, cooking over coals.
If you are able to do those things now, you won't be learning the principles fresh after the SHTF.