Well, here is a useful skill! How to make home made wine the old fashioned way. No carboys of juice, no air locks, no wine yeast, no hydrometer -- just natural fermentation run wild**! And if you don't get wine, you should get some great vinegar!
**Note: Not quite fermentation run wild. My Dad and Uncles made a lot of wine this way and it was pretty drinkable. They learned year-by-year on how to adjust to get the right sugar content and also how to store it. You leave it alone in a sealed barrel and siphon off what you need. Once you put it into a bottle, fill it to the top and keep it sealed until use -- then drink it! If you leave it, the contact with air will quickly turn it brown and sour the taste.