Combine ingredients in large mixing bowl (not metal). Mix together until well blended. Let stand uncovered in a warm place (80-85 degrees) for 48 hours; stir occasionally. Stir well before use. Pour out required amount and replenish remaining starter by mixing in 1 cup each of flour and warm water. Let stand uncovered in a warm place for a few hours, until it bubbles again before covering loosely and refrigerating. Use and replenish every two weeks.
Spoon flour into dry measuring cup, level it, do not scoop it.
Not a NESTLÉ®-tested recipe.