Craft's How to Make Vinegar

Although text is great, sometimes you just want to see what it takes to make something. In this case, I think it's handy to be able to watch the process of putting together your own vinegar.

As the source article suggests, one can order red wine vinegar mother online, or if you have a local brewery supply store, you can likely get it there. LocalHarvest also has a malt vinegar mother if you're more interested in making your vinegar out of beer instead. This is especially handy if you had a party and have a bunch of beer left over in a keg. If you have the space for it, you could make quite the batch.

via Craft.