"I've heard of kefir, but I'm not really sure what it is."
Kefir (dairy and water) is a probiotic drink. It has many of the same benefits as yoghurt, however, it has more of a probiotic punch. Kefir does more to balance your system & heal your "gut" with good bacteria. Kefir can also be used as a soda replacement. It is a fantastically better choice.
Kefir also contains many valuable enzymes & nutrients.
Water kefir is also known as tibicos & Japanese water crystals. No matter what you call them, they are fantastic for the body!