Vinegar is h2o and Acetic Acid. The Main Component inside the Acetic Acid may be the Acetyl Molecule.Acetobacter would be the bacteria that converts alcohol into Acetic Acid (Vinegar) and it is ubiquitous. Just leave an empty wine bottle lying all-around for 2 weeks and Acetobacter will discover it speedily and convert it into wine vinegar. Acetoba