Bread Flour: If you don't have bread flour, make your own by using 20 grams of vital wheat gluten and the rest of the weight in just all-purpose (AP) flour. So 20 grams of vital wheat gluten and 380 grams of the all purpose flour to start. If you don't have any vital wheat gluten, well, I guess you're using AP flour. Will turn out a bit different but still okay.