It is simple to make. Get yourself some milk kefir grains from a supplier (I bought mine from eBay).

Then follow the steps in this short video.

Making and eating fermented foods can provide you with some amazing health benefits including optimal gut health. When I started on my journey with fermented foods in the past I had no idea just how easy it was to make them myself.  Making your own results in far more nutritious food than store-bought fermented foods.

Books

Here is an affiliate link to Donna Schwenk’s book on fermenting that I found to be so very useful: https://amzn.to/488giNF

These two have been recommended by a subscriber:
Wild Fermentation
– The Flavor, Nutrition, and Craft of Live-Culture Foods
by Sandor Ellix Katz
2016
Chelsea Green Publishing
https://amzn.to/48bOHvk

The Art of Fermentation
An In-Depth Exploration of Essential Concepts and Processes from Around the World
by Sandor Ellix Katz
Forward by Michael Pollan
2012
Chelsea Green Publishing
https://amzn.to/3NhJ9ag

Web page for the video:

https://alternativeprinciplesforhealth.info/how-to-make-milk-kefir/