Kefir is a fermented milk drink that originated in the Caucasus region. It is made by adding kefir grains to milk and allowing it to ferment. Kefir grains are a symbiotic culture of bacteria and yeast (SCOBY) that looks like small, white flakes. The finished kefir has a tart, creamy flavor and contains beneficial probiotic bacteria.
You can buy kefir at most grocery stores, but it is also easy to make at home. All you need is milk and kefir grains. The cost of making your own kefir will depend on the price of milk in your area. In general, though, homemade kefir will be cheaper than store-bought varieties.
To make your own kefir, simply add kefir grains to milk and allow it to ferment at room temperature for 24-48 hours. The longer it ferments, the more tart the flavor will be. Once the fermentation process is complete, strain out the grains and enjoy your homemade kefir!