Do kefir grains have a water preference?
Because there are many other variables like the fruits and sugars you use, it’s difficult to suggest one water over another. However, kefir grains do usually fair better in mineral-rich water (mineral, spring, well, or hard water). Reverse-osmosis seems to damage them over time and is not recommended. They also do not like heavily chlorinated or otherwise chemically enhanced or treated waters. Water kefir grains will use what they can get, within the combination of the sugar source, fruit source and water source. If you want to rely more heavily on your water, then mineral-rich is preferred – in this case your grains will most likely require less help from unrefined sugars (like molasses, brown or rapadura for example) and less help from dried fruits (like coconut or apricots).
