So,I've been drinking water kefir or few weeks,than the idea (nothing new) came to my mind,to brew small batch of extract beer and ferment it with the kefir water,well seems like it works well,I couldn't find any solid info on the net,the og was 1.056 the FG is 1.010 ,it has a hint of banana smell,taste slightly funky,like good Saison or farmhouse ale,not much of sourness thought.as you can see it looks like regular ale fermentation.cheers,and keep brewing.