1/2 pkg. dry yeast
2 c. warm water
3/4 c. sugar
3 tbsp. instant potato flakes

Combine yeast and warm water. Stir until dissolved. Add rest of ingredients. Mix well. Let stand at room temperature loosely covered, 8 hours or more until bubbly and smells yeasty. Then put in refrigerator about 3-4 days. Then feed.