Starter

1/2 cup cool water
1/16 teaspoon active dry yeast or instant yeast
1 cup King Arthur Unbleached Bread Flour

Dough

1 teaspoon active dry yeast or instant yeast
1 cup to 1 1/4 cups lukewarm water*
all of the starter
3 1/2 cups King Arthur Unbleached Bread Flour
1 1/2 to 2 teaspoons salt, to taste
*Use the lesser amount in summer (or in a humid environment), the greater amount in winter (or in a dry climate), and somewhere in between the rest of the year, or if your house is climate controlled.