Combine flour, potatoes, sugar, and water. Mix well. Let stand overnight. Then, refrigerate. Feed after removing 1 cup to make bread.
BREAD:
Combine starter, water, and flour. Mix well. Let sour 8 hours. Add sugar, salt, oil, and baking soda to starter mixture. Mix well. (Additional flour may be needed to make a stiff dough.) Divide into loaves and let rise. Bake at 375° for 45 minutes.
