Here is a more specific explanation of water kefir thanks to Cultures for Health:
"Originating in Mexico, water kefir grains (also known as Sugar Kefir Grains) allow for the fermentation of sugar water or juice to create a carbonated lacto-fermented beverage. Incredibly easy to brew, the starter culture can create a new batch of kefir every 24-48 hours. This makes a fantastic non-dairy alternative to milk kefir and can be flavored after brewing to make a variety of delicious sodas. If you are looking to replace soda pop, your family will love it!"
|Rehydrated Water Kefir Grains (use plastic strainer, no metal)|
|Add 1/4 cup of organic sugar (any) to hot water, mix with plastic or wooden spoon (no metal)|
|Fill jar with cool water. Once water is at room temperature, add the grains.|
|Cover with coffee filter and let it sit on your counter top for 24-48 hours (the longer it sits, the less sweet it will be) The kefir grains "eat" the sugar, giving the beverage its probiotic qualities.|
NOTE: For optimal results, use spring water or well water to make kefir. I boil my tap water and chill it in the fridge, which is also acceptable.