What is kombucha tea?
Kombucha is a solution of tea, sugar and water that is fermented by a symbiotic culture of bacteria and yeast.  Or to put it another way, it's a cup of sweet tea (without milk), that has undergone a completely natural biological process to convert much of the sugar into other beneficial organic compounds.  If you have an understanding of cider making, you can think of kombucha as being fermented sweet tea in the same way as cider is fermented apple juice - the processes are quite similar.

Gluten Free Explained
Gluten is a protein compound found most commonly in the grains wheat, barley, rye and oats. Wheat and barley are often key ingredients in producing drinks such as beer and in sealing wine casks. Gluten free drinks avoid using such products.  To label as gluten free the product must have below 20 parts per million of gluten, which is barley a trace!

How is this product Vegan Friendly?
The drink is free from any animal products or derivatives. In addition the bottle, label and glue is also free from animal products.