Mix warm water, instant yeast, and bread flour. Add salt and mix again. The dough will be shaggy. Cover and let it rest for 1 hour.
Perform a coil fold: lift dough from the middle, tuck loose ends under, rotate 90 degrees, and repeat.
Rest for 30 minutes, then repeat the coil fold process. Do this 4 times in total.
Cover it, and let it sit for 45 minutes.
Preheat the oven to 450 degrees F and place a cast iron skillet or a baking pan on the bottom shelf of the oven.
Sprinkle flour on parchment paper, invert dough onto it, shape it into a rectangle, and divide it into 2 pieces with a floured scraper.
Separate the pieces by 2 inches and form each into a loaf by gently stretching it from the ends. Brush off the excess flour.
Transfer the parchment with the dough to a baking sheet. Let it sit for 20 minutes.
Place the baking sheet on the middle rack, pour 2 cups of water into the hot pan, and close the oven door. Bake for 25 minutes, until golden brown.