there is a whole section on kombucha here. https://www.homebrewtalk.com/f167/ as for mixing beer with kombucha, I have never tried it but it has intrigued me. I believe there are a few threads on the subject in the kombucha sub forum. and if you're looking to get into beer brewing, there are a bunch of great & helpful brewers on here that range from easy extract to more complicated all grain techniques. there is a wealth of information here.