Kefir is a fermented drink, loaded in probiotics, that can be made in two formats: milk or water. Water kefir is simply fermented sugar-water and milk kefir is fermented milk (typically cow, but other options like coconut are possible!). Kefir can be flavored into any combination tosatisfy any preference.The Masontops Kefir Capis designed to replace DIY solutions that are prone to failure and aren't reusable. Our lid system can be used to activate kefir grains (a live culture that supports the fermentation process) and brew endless amounts of kefir in wide mouth Mason jars. The lid is easy to use and can be washed and reused for endless use. Can also be used as a sprouting lid to sprout and strain micro greens