Closing the loop on your kefir comment, I did go out and purchase some kefir grains. Thank you for the suggestion!
Here’s my experience for those who may be interested:
I went to a few different websites and decided to go with Yemoos for the grains purchase. Kefir (kay-feer) grains are the starter culture. They look like tough gelatin marbles. The grains are the actual colony of beneficial yeasts and bacterium.
I purchased the intermediate kefir kit, which included 1.5 tablespoons of grains, a strainer, a wooden spoon, and a cotton topper for your kefir jar, which lets air through as the milk ferments. I also supplied myself a large red funnel, which fits the strainer perfectly and lets me pour the kefir into a glass. Otherwise you must strain into a bowl. I also supplied a large glass jar.
The kefir grains came quickly. Opening the package they smelled like beer, fresh bread, and sourdough bread.
I mixed the grains with 1/2 cup pasteurized “natural” milk from a local farm (they don’t sell raw milk) and 1/2 cup ultra-pasteurized, which is what the kids tend to drink normally.
So the jar of grains and milk mixture with the cotton cap on top went into a low kitchen cabinet for 24 hours.
The next day the milk was fermented! It was slightly less than 24 hours, because I wanted to establish the 24 hour schedule as the morning, but the grains had arrived the previous afternoon.
They say your first few batches will be a little off as the cultures recover from being mailed and as they become accustomed to the new milk.
This first batch was tangy. I wasn’t sure I liked it. I only drank a little to let my gut get used to the new microbes.
The kefir has three parts: the whey which is clearish liquid that pours through the strainer first, the curds which are soft and push right through the strainer with some pressure from a wooden spoon, and the grains which are rubbery and tough and would never press through the strainer no matter how hard you pushed.
Today is my second day and the kefir was much more delicious today than yesterday!
I poured off the whey and drank it first with some honey mixed in. It was like an effervescent drink of watered down apple cider vinegar. It was delicious.
Then I poured the true kefir, which is the curd particles, into my oatmeal. They only hold together loosely, so it’s easy to mix them with a spoon into a creamy drink. I sipped it before putting it in my oatmeal an it was also very nice with an air of potency. Fresh, crisp, slightly tangy. It was like a cream soda.
Some people take this kefir and put it in an airtight container to sit for another day. This will make it carbonated like a champaign. Make sure you burp it once or twice a day so it doesn’t explode from pressure.
All in all I’m very happy with this experience. The current grains ferment about a cup of milk every 24 hours into kefir and whey. It’s a satisfying routine, nice taste (will tomorrow taste even better I wonder?) and honestly, it feels amazing to be working with the natural world this way. I feel a connection to the kefir culture. I help it and it helps me.
I’m still a newbie. It I’d be happy to answer any questions people might have. No connection to Yemoos, by the way; I just thought they seemed like good people.