Remove the milk from heat and let it cool down a bit. To understand whether milk reaches the right temperature, use your finger if you don’t have a thermometer. Dip your finger into hot milk, if you can tolerate its heat inside for about 5-7 seconds (not more), it’s ok. It mustn’t be too hot or less hot than necessary. If it is too hot, you will get a sourish yogurt and if it doesn’t reach the right temperature, it takes longer time for the yogurt to form. It even won't turn into a desired yogurt if the milk is colder than it is expected to be.

Let the milk-yogurt rest at the warmest place of your home. Ideally, it is best to take the pot with hot milk to this place and let it wait there to reach the right temperature. It warms this place at the same time, which is a necessary step for thick yogurt.

Put a thick blanket under the pot (one of your jumpers will work just fine for this, its arms can hug the pot to protect it from cold). And then mix it with the starter in the way explained above. You can pour it into jars at this step if you like or just keep it in the same pot.

Put the lid on the pot, but don’t cover it completely as your milk-yogurt mixture needs some air inside. You can even use a suitable colander instead of its lid. This will help evaporation and yogurt will not be watery.

Then cover the pot with another blanket very well. Don’t forget we must protect it from cold.

Let it sit about 3 hours in summer when it is very hot, and about 4-6 hours in winter. Check it after this given time and if it is still not thick enough, keep waiting for some more hours.

Then, uncover it completely and wait for another 1 or 2 hours without the lid this time.

Next, when it reaches room temperature, gently place it in the refrigerator and wait it there for a day to have a better result.

You can place a paper towel on the surface of yogurt if it’s still so watery. This will absorb excessive water in it. You can throw the paper towel away and put a new one each time you take yogurt from the pot.