In a large mixing bowl, combine the sourdough starter and water. Mix until well combined.
Add the flour and salt to the bowl, stirring until a shaggy dough forms.
Turn the dough out onto a lightly floured surface and knead for 10-15 minutes, or until the dough is smooth and elastic.
Place the dough in a clean bowl, cover with a damp cloth, and let it rise at room temperature for 4-6 hours, or until doubled in size.
Once the dough has risen, shape it into a loaf and place it in a lightly greased bread pan or on a parchment-lined baking sheet.
Cover the dough with a damp cloth and let it rise for another 2-3 hours, or until puffy.
Preheat your oven to 450°F (230°C). Score the top of the loaf with a sharp knife, then bake for 30-40 minutes, or until the bread is golden brown and sounds hollow when tapped on the bottom.
Let the bread cool completely before slicing and serving.