I have just finished making a raspberry-vanilla-honey syrup to use in my second ferment of coconut water kefir. Since we are on the GAPS / SCD diets we have been finding every way possible to get more probiotics into our bodies. Coconut water kefir is a very delicious way to get extra probiotics as it creates a fizzy, champagne-like coconut water soda.
Personally I prefer using dairy kefir grains, which work quite well a few times, but since they prefer dairy to grow in they will get depleted and you will have to replace them. You can also use water kefir grains which just love a mineral-rich, sweet medium to grow in and coconut water is just perfect. If you are looking for cultures you can get dairy kefir grains here. The same method works for either dairy or water kefir grains.
Coconut water kefir is very rich in probiotics and it is best to only drink about 1/4 to 1/2 cup at a time especially when you first start drinking it.