*Choose a yogurt you enjoy eating, because it will impact the taste of your homemade yogurt. For the best quality, choose a yogurt that was more than 1 bacteria species, since they have different impacts on gut health. For example, a yogurt might contain just "S. thermophilus," or might contain "S. thermophilus, L. bulgaricus, L. acidophilus and L. casei." In general, the more bacteria, the better.