Kombucha Makers Unite; Where to ask and be answered in Recipe Sharing Posted December 6, 2017 it depends on how you like it, but ideally if it still tastes sweet then there's still sugar, so you probably should leave it a bit longer. After the first 7 days, just keep trying it everyday. at some point it will no longer taste sweet, and then as you leave it longer it'll get more and more vinegary. stop and bottle at whatever point you feel comfortable with the amount of vinegar taste. Add sugar to the bottles, and that will then ferment in the bottles to produce the fizz (I use around a half to one teaspoon per litre bottle), leave for maybe a couple of weeks warm for that sugar to completely convert. I do tend to make a batch which takes probably three weeks or more to make and then I might drink it all before getting another batch on so I don't always have some around. Strictly speaking, whilst on W30 you shouldn't be having any added sugar, so you can add apple juice, or some other naturaly sweet addition to the bottle for conditioning, and if you leave it long enough the sugar will be converted, and there'll be some fizz. or you can avoid that step by bottling whilst still slightly sweet. with this process you shouldn't get bottle bombs, but if there's a lot of sugars to ferment, and you have deficient bottles, and you fill too full, and you leave too warm for too long, well, then you might get an explosion - but it's incredibly unlikely.