In a large mixing bowl, combine 6 cups flour, 1 tsp dry active yeast, and 2.5 tsp salt. Stir well. Slowly blend in enough water to create a dough. Cover with plastic wrap and allow it to rise for 12-18 hours or until doubled in size.
Turn dough out onto floured surface and fold with flour covered hands. Begin to work the dough into a smooth ball by gently pushing the outer sides into the bottom and tuck them in until the top is smooth.
Wrap the dough in the parchment and then cover the parchment with the tea towel. Allow the dough to rise once more, two hours.
Preheat oven to 425 with dutch oven inside.
Turn dough into the dutch oven with the seam up. Cover and bake for 35 minutes covered and the last 5 minutes uncovered for a total of 40 minutes.
Remove bread from the dutch oven. If it sticks you can use a knife around the edges to loosen it up.
Allow the bread to cool on a wire rack.
Notes
Left over bread can be used for making croutons, sandwiches, or bread pudding.