Making a Sourdough Starter

I'm back into my bread baking hobby.
The cold of winter gets me to thinking
about baking up some loaves of bread.
One kind of bread to make is sourdough
that has a tangy taste and is good.
Here is how to make the sourdough starter.

Ingredients:
2 cups warm water
1 tablespoon sugar
1 packet yeast
2 cups flour

Directions:
In a 2 quart mixing bowl.
Use hot tap water or heat cold water
in microwave to about 100 degrees F.
Disolve in sugar and pour in the yeast
stir to disolve yeast and let sit for
about five minutes for the yeast to bloom.
Slowly stir in the flour and cover with
a towl to let rest at room temperature
for five days, stirring mixture once a day.
Cover and refrigerate until ready to use
in your bread baking recipes.
Usually recipes call for one cup of starter
and when you remove starter, add in equal
amounts of water and flour to the bowl.
And leave the bowl at room temperature
for 1 day, then stir mixture and refrigerate.