I'll mention that you don't need to increase your supply to what it was way back when, just do enough to bring it back up to what he needs for now.
My supply fluctuates, as does Kate's demand. Two weeks ago she was barely nursing much at all, but now she's sick and possibly growth-spurting and she's eating all. the. time. Best thing I've found for getting supply back up is to simply let her nurse as much as she wants. It always sorts itself out. I really avoid giving a bottle of breastmilk unless I can pump the same amount.... I want to make sure she's getting everything she can out of me to encourage my body to produce more milk to keep up!