Oh! Thank you for this. I read the whole previous discussion, and it never once occurred to me in all that, that my instapot has a yogurt setting, and that you could culture from a commercial batch... the exact same way I inoculate new batches of kraut with brine from the old batch, and have made kombucha using the dregs from a purchased drink. doh!

Sometimes the old lightbulb has to buzz and flicker for a minute before it blinks on ;)