If you learn nothing else in this life at least learn how to do these three things: 1) make a fire from raw materials 2) find/purify water and 3) make vinegar from scratch. The reason why I say this is tenfold. First off, on the way to making vinegar you make alcohol which is an anesthetic, a sterilizer, a fire starter, an explosive and a good time. Vinegar itself is medicinal, detoxifying, cleansing as well as many other things. You can make bug repellent out of vinegar, kitchen cleaner, salad dressing, treat heartburn (some say, never worked for me) and use it to aid in weight loss (some say...). The best part about all of this is that you can easily make it from scratch and from scraps.
There's a couple ways to start this process. You can start with a gallon of juice (freshly juiced apples for instance) and put it in a sealable container with an airlock. This way carbon dioxide can get out without any of the wrong bacteria getting in. This will need to ferment 4 to 6 weeks in room temperature. It will bubble up as the natural yeasts work on the sugar. You can also start out with apple cores and simple sugar. You fill up a large container with apple cores and boil down sugar (3 tsp to 1 cup of water. Fill container until apples are covered). With both methods, the bubbles will eventually dissipate and you will have your alcohol base. Next, it is time to move to the second stage and turn it into vinegar. If you have a "mother" or a vinegar scoby you can use this now to not only speed up the process, but further insure your success. If you have Bragg's ACV it comes with the mother. If not you take a gamble and hope it just catches the right bacteria. Instead of the airlock top, you'll now want to tie on some cheesecloth so that air can move freely in and out and feed the yeast spores. This second fermentation can take quite a bit of time sometimes up to 6 - 9 months. Once fermented it will be very strong so you can always dilute to taste.
Will follow up with a Kombucha variation on this recipe. Kombucha has many healing properties included mood stabilization and help with a hangover from your previously concocted DIY alcohol.