<<Disclaimer: Verify this information before applying it to your situation.>>

Vinegar can be made from a wide variety of substances:
http://en.wikipedia.org/wiki/Vinegar

It is the PROCESS of distillation that renders the vinegar to be gluten 
free:

From: http://en.wikipedia.org/wiki/Distillation

Distillation is a method of separating mixtures based on differences in 
their volatilities in a boiling liquid mixture. Distillation is a unit 
operation, or a physical separation process, and not a chemical reaction.

Commercially, distillation has a number of uses. It is used to separate 
crude oil into more fractions for specific uses such as transport, power 
generation, and heating. Water is distilled to remove impurities, such as 
salt from seawater. Air is distilled to separate its components-notably 
oxygen, nitrogen, and argon-for industrial use. Distillation of fermented 
solutions has been used since ancient times to produce distilled beverages 
with a higher alcohol content.

Janice 

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