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In a large mixing bowl, whisk together flour, salt and yeast. Add water and mix until a shaggy mixture forms. Cover bowl with plastic wrap and set aside for 12 - 18 hours. Overnight works great.
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Heat oven to 450 degrees.
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When the oven has reached 450 degrees place a cast iron pot with a lid in the oven and heat the pot for 30 minutes.
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Meanwhile, pour dough onto a heavily floured surface and shape into a ball. Cover with plastic wrap and let set while the pot is heating.
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Remove hot pot from the oven and drop in the dough.
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Cover and return to oven for 30 minutes. After 30 minutes remove the lid and bake an additional 15 minutes. Remove bread from oven and place on a cooling rack to cool.