You can make yoghurt at home using common kitchen supplies.
As an alternative, yogurt makers consisting of a plastic thermos with a small heat element that keeps the yogurt at the correct culture temperature are inexpensive.
Ingredients:
½ gallon milk
2 tbsps. thickener (pectin or gelatin) OR ¼ cup dry milk powder
1 packet yogurt starter OR ¼ cup live culture yogurt
Process: