WH, you're right about the non-chlorinated water, no metal bowls or utensils. Believe me as a l-o-n-g time Scout and Scouter I have made many dutch ovens full of sourdough bread and the right water is important. For home use, wife and I have an 8" DO, with cover, and we often bake bread in it. I got tired of messing with the starter, replenishing it, etc. and found this recipe which, while not sourdough, is mighty tasty and easier to make than falling off the proverbial log. It is important to measure ingredients exactly, don't use the "I guess this will be OK" method. This is for the 8" diameter DO.
435g all-purpose flour / 1 1/2t salt / 1/2t yeast / 1 1/2C water @ 90-100 degrees. In a glass bowl whisk together flour, yeast, salt. Make a well, pour in water. Let it sit 5-10 minutes, then with a wooden spoon mix into a shaggy ball. Cover tightly with plastic wrap then put it in a cold oven on the center rack, with the light on for 6-8 hours to let it rise. Remove dough, set oven on 450 and preheat the DO with the lid on for 30 minutes. This is important, don't begin baking with a cold DO. While the DO is preheating, turn out the dough on a floured mat, add some flour to the top of the dough. Quickly form into a ball. Don't knead it! Loosely cover with plastic wrap and let it sit on the mat. At the end of the 30 min preheat, remove cover and dust bottom of DO with cornmeal. Plop in the dough. Bake for 30 minutes with the cover on. Remove cover and bake another 15 minutes. Bread is done when internal temp is 190-200 and sounds hollow when knocked. Grab some real butter and dig in!