Everlasting Yeast recipe

1 quart warm potato water
1/2 cake yeast or 1/2 tablespoon dry yeast
1 teaspoon salt
2 tablespoons granulated sugar
2 tablespoons flour

Stir in all ingredients and put in a warm place to raise until ready to mix for baking. Leave small amount of Everlasting Yeast for the next time you make bread. Keep in cool place and add to the Everlasting Yeast all of the above ingredients except the yeast. Do this each time and you will never run out of yeast. Now add the Everlasting Yeast that you took out and make the bread the way you always do.