My husband and I have been making yogurt homemade for about a year and a half, and our family loves it. Before we started making our own yogurt, we would buy the quart sized plain yogurt, and then add our own fruit and sugar. We just thought that the already sweetened yogurts were just too sweet. Then we decided that we wanted to try making our own. We looked on the internet, and saw the basic process on a few websites (I have no idea what they are now). We first tried it with 1 gallon of milk, and it turned out great. Here is how we do it now.
1. Heat 2 gallons of milk in a big pot. I just put them in in the morning and turn it on medium low. Usually around noon, it has been heating long enough. I check it with a themometer. When it is over 190 degrees, it is warm enough. Then I put the pot in a sink full of cold water to cool it off. It needs to cool off to 110 degrees and then it is safe to put the yogurt culture in.

Check Temperature
2. When it is cooling, I take 5 cups of powdered milk and blend it in the blender with some of the milk. It’s not a problem to put the powdered milk in the milk that is over 110 degrees. I usually do about 1 1/2 cups of the powdered milk at a time. I put the powdered milk in first, then the warm milk after. It makes more of a mess if you do it the other way around.

Blending powdered milk with milk
3. After the powdered milk is blended in with the regular milk, I check the temperature. If it has cooled to 110 degrees or below, then I blend up an 8 oz container of plain yogurt with some milk.
4. After I am done blending the powdered milk and yogurt in with the milk and have given it a quick stir, I pour the milk mixture in quart jars. I use a 4 cup measuring cup and it works great. Also, I like using wide mouth jars, because it makes scooping out the yogurt much easier. This makes 9 full quart jars.

Fill quart jars with yogurt
5. I then fill a cooler with water that is about 110 degrees and place the jars in the water. The water should come up about half way on the jars. As you can tell, my children love helping with this part!

Setting jars in cooler with warm water
6. Let the jars sit in the water for 5-8 hours. There have been many times when I’ve let it sit longer, and it has turned out fine. You can tell when it is done because it will have thickened to the consistency of (surprise) yogurt. I then just take them out, dry them off, then put them in the fridge.
7. After they have cooled, you can take a quart of yogurt and add some fruit (I try to just cover the bottom of our bowl with fruit) and sugar to taste (we use 1/4 cup).

Strawberry yogurt - Yummy!
We love making our own yogurt! It is creamy and has that yogurt tang to it. We love it! Good luck!