Milk and water kefir are fermented beverages, like kombucha, loaded with probiotics and other healthy bacteria. Milk kefir can be made with a variety of milks, including cows milk or coconut milk, and water kefir is fermented with a simple sugar-water solution, but can also be made with coconut water.
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I love these lids for my kefir water and my kefir loves them too. Great product.