I am making bread once a week with 3 and 1/2 cups of flour and using 2 tsp of yeast. I bake it in a cast iron skillet and it gives it a nice fragrance. I would like to try with a biga, but all the recipes are for a lot of bread, and I need only a biga for one bread. Can anybody give me a recipe for one biga for one bread? Also how do i find out or calculate the hydration of the biga ????