Note: If you do not have a dehydrator, you can also place the yogurt in a cooler, wrapped with a towel. Place a pot of boiling water in the cooler and close it up. Make sure that the inside of the cooler remains warm for 24 hours. This method is a bit more tricky with temperature control. I have even seen yogurt made in a crockpot. I don't generally recommend this method because the low setting on a crockpot is typically higher than 110*F. For best results, it is worth buying a high-quality dehydrator or inexpensive yogurt maker.