Water
I make my dough using room temperature water. The importance of water cannot be understated. Too little water and your dough will be too stiff and not very extensible. That means that when you flip it it will not stretch out nicely. Too much water and your dough will be too pliable and lack enough resistance. A hydration level of about 60%is about right. (Hydration level = Water weight/Flour weight X 100)