Heat the coconut water such as Vitacoco, in a pan until it is barely warm - about 30 degrees celsius

Place in a glass jar or bottle and add the water kefir grains

Cover with muslin or cheese cloth and leave for between 24 to 48 hours - on the kitchen counter will be just fine. The final product should be slightly fizzy and should have lost its sweetness as the natural sugars in the coconut water would have been eaten up by the kefir grains

Seal the jar or bottle and keep in the fridge - it will keep for months