There are two ways to make kefir soda, which is slightly different in process then making water kefir. with water kefir crystals. The difference is in the culture you use. Kefir soda can be made using either kefir powder packages (we recommend the one by Cultures for Health), or using kefir whey from milk kefir.
Both methods are fun, easy, bubbly, and delicious. However, they’re not dairy free. Both methods still use a culture from milk kefir, which has a small amount of dairy in it. If you’re wanting to make a dairy free drink, you should try making water kefir.