In a big bowl mix flour and salt together.
Stir mixture into water and pour right away to the flour mixture, stir with wooden spoon until mixed well
Cover the bowl with plastic wrap and let it stand either on kitchen counter or inside cold oven for over night, then take out
Place a cast iron pot into the oven, if you don't have, you can use round pyrex with lid. Preheat oven to 475 along with the cast iron pot.
Take out the cast iron and remove the lid
Flour your work surface and dump dough from bowl onto flour, to coat upside down and sides then place dough into cast iron pot and put the lid back
Bake for 30 mins with lid on then take the lid off and bake again for another 15-20 mins
Let cool on rack before slicing and enjoy :)