Combine 1 cup warm water and the yeast in a glass bowl or large measuring cup.
Pour the warm milk and remaining 1 cup water into a large mixing bowl.
Wait five minutes, then pour the yeast/water into the milk/water in the large mixing bowl. Stir.
Gently stir 2 cups of flour into the water/milk/yeast mixture until smooth.
Add salt and the rest of the flour (4 cups) to the mixture. Add the flour in small amounts, blending after each addition, Keep stirring until the dough starts to pull away from the sides of the bowl.
Tip the bowl over a lightly floured board to let the dough fall onto the floured surface. Knead until smooth, sprinkling flour on the sticky spots as needed, for about 5 minutes.
Spray the inside of a large glass or ceramic bowl with cooking spray. Set the dough ball in the bowl. Cover the bowl tightly with plastic wrap.
Let the dough rise for 8 hours or overnight in a cool place. Note: this dough can become VERY fluffy if conditions are ideal. You may need to poke it down gently with your fingers occasionally to keep it from escaping the bowl!
After 8 hours, pull back the plastic wrap, punch the dough down and replace the plastic wrap. Refrigerate 8 hours or overnight.