Pour entire contents of the starter bag into a non-metal bowl. Add 1 1/2 cups flour, 1 1/2 cups sugar, and 1 1/2 cups of milk. Mix well. Measure out 4 separate starter bags by pouring 1 cup batter into 4 separate 1 gallon ziplocl baggies. Mark each bag with that days date. Keep one for yourself and give three to friends.