To make Sourdough Starter:
2 cups warm water
2.3 cup sugar
6 TBL instant mashed potato flakes ( 1/2 of bread flour will also work)
1 pkg of rapid rise yeast ( or let set out for 7 days. stir after three days in a warm dark place)
Mix all ingredients in a bowl or large glass jar and cover loosely with foil. The yeast will feed on the potato flakes and sugar, and the starter will give off gas as the yeast breeds. If the container is tightly sealed, the yeast will die. Keep at room temperature for 24 hrs then refrigerate.