See how to rehydrate grains
Always start with a clean work area and tools.
Metal can damage the Water Kefir grains, use glass or wood when possible.
Kefir Grains do not like fluoride or chlorine, so filtered water works best. However, the water is then stripped of natural minerals. I've found excellent results in introducing additional mineral ingredients such as molasses, or palm sugar.
Storing the bottled kefir in the fridge will slow down the fermentation, no need to burp!