Hope I have posted this in the right place... I read a post recommending drinking kefir to help with gut problems and possibly acne. I'm pretty sure I have gut problems and I definately have acne

So, I did some google research on where to buy kefir in the UK and am now completely confused. There appear to be 2 different types - water kefir grains or milk kefir grains. Plus I've also come across kombucha which is also supposed to be good for you.

Can anyone help me with what I actually need?! Any suggestions as to reputable places to buy from also gratefully received.

Thank you