Red wine vinegar is really easy to make at home. All you need is some leftover red wine, some water, red wine vinegar mother, and a few tools. You can look for red wine vinegar at your local homebrewing shop, but mine was out, so I ordered it online. It's basically "live" red wine vinegar which contains the bacteria Acetobacter, which eats alcohol and turns it into acetic acid, the tangy flavor we know as vinegar. This project appears as an article in CRAFT, Vol. 9 by Alastair Bland. Read more at blog.craftzine.com/archive/2009/02/making_red_wine_vinegar_craft.html