Make Greek yogurt at home

The advantage of Greek yogurt is that it is high in protein. But the problem with Greek yogurt is that it tends to be really expensive. The easiest way to cut the cost is to make it yourself.
What you need:
Milk (whole milk is better, at least 2% fat milk)
One 6 oz container of plain yogurt
Blanket
Pot

Steps:

1. Heat the milk with a pot to just before boiling -- keep stirring to avoid burn.
2. Let the milk cool to 110F. If you don't have thermometer, use your finger, insert your finger to milk no more 10 seconds. if more than that, it is too cold. if longer than that it is too hot.
3. Add the yogurt to milk, stir well.
4. Cover the pot with blanket for overnight on the counter top.
5. On second morning, when you open the pot, you will see the some water (whey) on the top of the yogurt. You can pour the water, or you can keep the water. Then put the pot in refrigerator for whole day (24 hour). You can see more whey. Pour the whey*. Your Greek yogurt is ready for enjoying.

* You can keep the whey for cooking.