u/bambibayy

I really want to make my own liquid culture, but unfortunately I don’t own a pressure cooker yet. All recipes I‘ve seen on here include using a PC, but I’ve seen a video by fungia in which he mentions that you can also use a water bath but didn’t go into much further detail. So would this be an option or is it not worth the risk?
And if it is an option how should I go about it?