How to make vegetable broth?

Veggies and salted water, simple. Why spend full price for veggies that you're going to throw away after you simmer them for a few hours. What I do is talk to the produce handler in the morning when he's restocking and pulling day old produce out of the bins, tell him what you need and he will bag it up and put a "bulk" price on it that is below half of what you would pay normally, save money and make a friend