Make Dough: In a large mixing bowl, whisk together flour, salt, sugar, and yeast. Pour water over dry ingredients and stir until no dry spots remain. The dough will be very sticky, but just scrape down the sides as you stir.
First Rise (45 minutes): Cover the dough with a clean dish towel and leave it on the kitchen counter to rise until doubled in size, 45 minutes. (If your kitchen is on the colder side, let the dough rise for 60 minutes.)
Set out a large sheet pan (or two sheet pans). If you’d like, you can add a piece of parchment paper to the sheet pan which will make it easier to remove the bread and eliminate any chance of sticking. Dust the pan with all-purpose flour (see note).
Shape Loaves: Use a knife to slice down the center of the dough, separating it into even halves (the dough is very sticky, so don’t worry about being super precise). Dust the surface of the dough and your hands with flour. Working with one half of the dough at a time, transfer it to the prepared sheet pan and form it into two side-by-side baguette-shaped loaves. (If things get sticky, dust with some more flour as you work. These loaves may not look picture-perfect, but they'll taste great!)
Heat Oven: Preheat oven to 450°F / 232°C. (If you have an oven that heats up fairly fast, you can wait to start heating the oven until the dough is nearly through the second rise below.)
Second Rise (45 minutes): While the oven heats up, leave the dough to rise on the sheet pan, uncovered, until nearly doubled in size, 45 minutes.
Just before baking, use a knife or kitchen shears to cut slits in the surface of the dough. (These slits help the dough to spread out and rise as it bakes, but they’re also decorative - giving the bread some more texture and color on the surface.)
Bake bread (25 minutes): Bake bread in the heated oven until the top is golden brown and crisp, about 25 minutes. (Use an instant read thermometer if you have one. The bread is done when it reaches 190°F / 88°C in the center.)
Transfer loaves immediately to a cooling rack. Allow to cool slightly and serve!