On a side note: Purchase a bag of vital wheat gluten, a 2lb/1Kg bag will last a very long time. The difference between AP flour and bread flour is the gluten content. You can bring any regular AP flour up to the highest gluten level that a high gluten bread flour brand like King Arthur will produce. One tablespoon of vital wheat gluten exchanged for one tablespoon of AP flour for every two cups/240 grams/2.4oz of AP flour is a provides a good high gluten ratio. I use it regularly in my bread recipes and pizza dough recipes. I only keep bread flour on the shelf for those days when I am feeling lazy or need a very specific brand of bread flour for one specific recipe.