Sometimes in my line of business, the bottles of wine just pile up. There is only so much one girl can drink! I hate to let anything go to waste, so I have started to use my leftover wine to make vinegar. While you may not have the exact same problem, half-empty bottles and leftovers from parties do add up. As long as the wine tasted good to you, it is suitable for transforming into vinegar.
I'm still waiting for my first batch to finish, but this recipe adapted from Paula Wolfert at Food & Wine will let you brew along with me.