Maiana's Sourdough Bread, adapted
This is how I currently make sourdough bread, constantly evolving and now including new steps from Maiana's recipe.
750g flour (Maiana uses 100% white spelt, and it's awesome; I use ~200g whole spelt, and 550g either white spelt or white bread flour (the former has slightly better flavor, the latter has slightly better rise, and both are great). You can also use all white bread flour, which might need a tiny bit more water to make a dough that isn't too stiff)