when we lived in caves, it was very easy to make yogurt. you poured milk into a jar, put it on the stove right over the pilot light and went to sleep. next morning, bingo! yogurt.
now it's become a hooha. i'll give the crockpot a try, but i won't bother with the thermometer. i refuse to add another item to my kitchen. i'm hoping that everything wears out so i can never cook again.