1 pkg. dry yeast
1/2 c. lukewarm water
2 tbsp. sugar
2 c. warm water
2 1/2 tbsp. all purpose flour

Mix yeast with 1/2 cup lukewarm water. Mix sugar with 2 cups warm water and flour. Add yeast mixture. Let sit in glass jar covered with cloth for 5 days. Refrigerate mix 3-5 days, then begin to feed.