Mix everything together until a shaggy dough forms. Cover and let set for 30 minutes.
Perform 3-4 sets of stretch and folds about 45 minutes apart (timing isn't super important - see video).
Allow to bulk ferment on the counter for 4-5 hours.
Form into loaves and place in prepared bannetons.
Cover and put in the fridge overnight.
The next morning, remove from the bannetons, score, and place on parchment paper in baking dishes.
Put in a COLD oven and set the temperature to 450 degrees. Set the timer for 55 minutes.
After 55 minutes, remove the lids, and bake for another 15 minutes.
For best results, allow to cool before slicing.
Video
Notes
If you do not have two dutch ovens, put the second loaf into the dutch oven as soon as you remove the first loaf. Then bake at 450. Covered for 30 minutes and then remove the lid and bake for 15 more minutes.