If Kombucha Tea (trace amounts of alcohol) is used as medicine, is it considered a breach of conduct? I drink kombucha, a fermented and very slightly alcoholic tea, in order to ease recurring gastrointestinal distress. Although I use this drink as a tool, is it considered a breach of the fifth precept?
The purpose of that precept is to prevent loss of heedfulness through intoxication.

If your reason to drink tea of some kind with very little alcohol in it, is for medicinal purposes, and if it does not cause the loss of heedfulness through intoxication, then there is no violation of the precept in my opinion.