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RE: How To Make VINEGAR: One of the Cheapest, Healthiest, and Most Useful Solutions!
Great question @mcwhackery! If you cover fruit with a sugar-water solution, put a cheese cloth over it, and set it on a shelf for awhile, it will eventually turn into vinegar because organisms from the air will start the chemical reaction. It takes longer, and results are more varied because you're not so sure about what creatures are in the air, but eventually vinegar will form.
You can also ferment the solution using yeast of any type, even baker's yeast will work. After the fermentation has been accomplished, acetobacterium will be quickly attracted to the alcohol and metabolize the ethyl-alcohol into vinegar.