This is pretty much the standard way of making yogurt. The way to incubate it differs according to what works best for you. If using a cooler and heating pad doesn’t work, I encourage you to be creative or check the internet to find the best fit for you. It certainly is worth it to find a way to make this nutritious and delicious beverage for you to enjoy.
Some additional notes:
—If taken care of, a mother culture can last a long time. But it can become weak with time or it can get contaminated. One way to tell a new starter is needed is if, considering that all other things are done properly, the yogurt starts to continually taste a little too sour for eating. Then it’s time to create a new mother culture.
—If the yogurt has separated when taken out of the cooler, it may have been incubated too long or at too high of a temperature. Just make adjustments when making the next batch.
—Homemade yogurt tends to be a little runnier than store bought since it does not contain any additives. You can add gelatin or powdered milk to thicken it. Also, initially heating the milk to 180 degrees and then letting it cool to 110 degrees before adding the starter may help with thickening (as this changes the protein structure).
— It is a real treat to drain the whey from the yogurt to have a Greek-style yogurt. You can use the whey for other purposes.