Sourdough Starter

2 cups flour
2 cups warm water
1/4 cup powdered skim milk
1 Tbsp yeast

Combine and let set in warm place 2-3 days.  (covered)  Stir 3 times a day.  To keep, place in fridge in anything but metal container.  To keep starter alive use at least once a week.  If not add 1 tsp sugar to starter.    (Put 2 cups of starter in fridge and use the rest to make something.)