It’s stupidly easy, laughably cheap, and takes next to no hands-on time. 1 quart (946ml) milk (any kind but not “ultra-high pasteurised”/UHP or “ultra heat treated”/UHT) 1/4 to 1/2 cup non-fat dry milk (optional) 2 tablespoons existing yoghurt with live cultures You can easily scale this up – I made a gallon batch, added 1…