Does accidental vinegar have a culture that I can pass along? Background: A couple of years ago we left a half drunk bottle of Sirah on the counter and it went to vinegar. A really nice vinegar with a pleasant, mild flavor, and we've been using splash here and a bit there ever since. Now I'm down to circa half a cup.

Is this a live culture like a bread starter? Can I buy a bottle of a similar wine, and intentionally propagate the flavor of this stuff? Or is just a crap-shoot?
This video of Alton Brown - Good Eats explains it way better than I ever can.
http://www.youtube.com/watch?v=8JEi4OW2Q54

If your bottle of wine turned to vinegar you probably have some "mother" at the bottom of that bottle that you can use in your next batch.