Grape kombucha is one of the most popular kombucha flavors. The grapes add a wonderful full rich flavor. In our home we have made many bottles of grape kombucha. I have also had a few bottles explode and hit the ceiling several times. Grapes ferment really well! We now have permanent grape stains on our kitchen ceiling after my husband announced it was going to be a landmark in our home. He fixed the ceiling stains twice and wasn't fixing it again, lol.
Make sure you use good bottles made for brewing.