Vinegar is h2o and Acetic Acid. The key Aspect from the Acetic Acid would be the Acetyl Molecule.Acetobacter will be the germs that converts Alcoholic beverages into Acetic Acid (Vinegar) and it's also ubiquitous. Just leave an empty wine bottle by now there for a few months and Acetobacter will find it promptly and transform it into wine vinegar.