Dissolve one package of dry yeast in a half cup of warm water. When the yeast and water begin to bubble, add 2 teaspoons of sugar or honey, 2-1/2 cups flour and 2 cups of water. Store in a sterilized large glass jar (crock or plastic jar are also acceptable.) Cover with clear plastic wrap. Do not use a metal container or utensils!
Keep at room temperature for 24 to 48 hours. The mixture will bubble up and should be stirred down and then placed in the refrigerator. Stir daily with a wooden or plastic spoon. On the fifth day, you will need to feed the sourdough starter. Add 1 cup flour, 1 cup of milk and 1/2 cup of sugar and stir well. On the tenth day, take out 2 cups of the starter for baking , then feed same ingredients as on the fifth day to keep starter going.
The sourdough starter can be used to make bread, pancakes, etc.