Vinegar is drinking water and Acetic Acid. The Main Section within the Acetic Acid would be the Acetyl Molecule. Acetobacter could be the germs that converts Liquor into Acetic Acid (Vinegar) and it's ubiquitous. Just leave a broad open wine bottle lying all around for 2 weeks and Acetobacter will see it swiftly and transform it into wine vinegar.