You can infuse vinegar or alcohol in pretty much exactly the same way. You can use almost any fruit to do it, too. I bet there are a few veggies that would be kind of awesome in an infusion, too. Cucumber vodka could be really refreshing and delicious, I think. Vanilla beans would also work pretty much the same way as the fruit if you want to go that route.
Step 2. - Scrub a dub dub. Wash your produce really well. If it's not organic, give it a little splash of vinegar to help get the yuckies off and then give it another rinse.
Also wash the heck out of your jars! Oh yeah, you need some 1 liter mason jars or those cool glass jar things with the rubber seals. Wash these in super hot water. If you have a dishwasher, run it through there on the hottest setting to make sure you've sanitized the glass. Yes, you need to use glass for this. Metal will end up tasting like metal and could put some rust into your final product which is gross either way. Plastic is not your friend, either. Plastic can leech mojo into your final product and I feel like it absorbs flavors. Glass is best. Just trust me on this.
Step 3. - Mix everything together in your newly cleaned jars. You're going to use 2 cups of produce for 2 cups of liquid be it alcohol or vinegar. If you're doing two kinds of things at once, make sure you label things so you don't accidentally give Aunt Edna the gin when you meant to give her the vinegar.
Step 4. - Mash! At this point you can either take a wooden spoon and mash the crap out of your produce or you can blend it up a bit. You'll decide this depending on what kind of thing you're using as your flavor. For example, if you're using roasted garlic or cucumbers, you'd probably just want to smush them with a wooden spoon. If you're using berries, you could blend them if you want. It doesn't actually make much difference which way you choose. I tried one batch of blended and one batch of mashed fruit and they came out pretty much the same in the end.
Step 5. - Put the lids on tightly and shake!
Step 6. - Put your jars in a dark place and take them out once or twice a day to shake them. That helps to keep the flavors blending together and makes a better infusion. Usually 1-2 weeks will do the trick.
Step 7 - Strain! I used a jelly bag, but you can use a sieve or some cheesecloth if you want. Strain your shiny new vinegar or alcohol into a super clean glass container. You can use another jar, the original bottle or get some fancy containers, however you want to do it.
The jelly bag in action
Step 8. - Sit back and admire your awesomeness.