To make homemade yogurt, you need 4 cups of nonfat or low-fat milk and 1/4 cup of nonfat or low-fat plain yogurt to use as a starter. Plus, she will need a large saucepan, a candy thermometer, a clean 5 to 8 cup container and a few clean kitchen towels.
To make homemade yogurt, heat the milk in the large saucepan over medium heat. Stir the milk frequently in order to help it heat evenly. When the milk reaches 180 degrees Fahrenheit, remove it from the heat and pour it into a clean, 5- to 8-cup, heat-safe container. Allow the milk to stand, and stir it frequently until it reaches 110 degrees Fahrenheit. Next, combine 1/4 cup of plain yogurt with 1/2 cup of the heated milk in a small bowl. Stir the mixture, then add it back to the rest of the milk. Stir to combine. Next, cover the container with the milk and yogurt in it, then wrap the entire container in a large, clean kitchen towel to keep it warm.
To finish the yogurt, place the container in a warm environment and leave it undisturbed for eight to 12 hours. Next, refrigerate the yogurt until it's cold, then enjoy.