It's like a scoby (when making kumbucha), but in a different symbiosis between yeast and bacterias. They ferment sugars into lactic acid bacteria. All you need is water, sugar or/and some dried fruits and lemon juice and the kefir. And after 2-3 days you can already harvest the drink. If you leave it longer, it can be a little alcoholic... Kefir reproduce themselves super fast. Ask in your vicinity who has kefir, and they will gift them to you thankfully ;) Sometimes you can find them also sold in a natural pharmacy or organic shops... It's such a refreshing and healthy drink 🤗💚