For my kombucha and water kefir bottles, I use a sanitizing detergent called Sparkle-Brite. It doesn't have any ingredients listed on the label. I buy it at my local u-brew wine shop; according to the woman who works there, most of her customers call it "the pink stuff".
The instructions say to dissolve 3.5 grams per litre of cold water and allow your bottles/equipment to soak for 20 minutes, then rinse with hot water.
The instructions say to dissolve 3.5 grams per litre of cold water and allow your bottles/equipment to soak for 20 minutes, then rinse with hot water.