[header] How to make yogurt from powdered milk [title] Experiment with different arrangements. [step] For this article, there is a small coleman camping cooler that measures 10 inches (25.4 cm) wide by 17 long by 11 tall. This size is perfect for holding 4 2 quart ball canning jars of yogurt and 4 half gallon jugs of hot water to help keep it all warm. 
[title] Don't bother measuring the temperature with a thermometer. [step] Just use the hottest water you can get from the kitchen tap.