Here is what I do:
Put grains in a clean jar
Fill with organic, grass-fed, non-homogenized milk leaving about an inch from the top
Cover with plastic wrap (to allow air to escape)
Let ferment 24-48 hours in dark at room temperature (usually 48 hours)
Strain with a plastic strainer to separate kefir grains from kefir. Use a wooden spoon to stir and help strain.
Pour kefir into a clean jar or bottle, cover with plastic wrap and let ferment for another 24-48 hours in the dark at room temperature. IMPORTANT to do this so all the sugar and lactose is gone, plus more probiotics.
After this period, put it in the fridge and you can consume as you please. I like mine plain, but hemp protein powder is good with it too. I’m sure stevia and blueberries would be tasty.
I always start a new batch when I separate the grains.
Shake up your jar during the fermenting process.
Don’t use metal jar lids, as the probiotics don’t get along with metals (though stainless steel is fine)
It should start to look thick once it is ready, and you can smell it to tell if it is ripe