Okay, here's a shot of one we used last season. It's not full enough but that will be fixed at plant out. You can see the nail used to keep the PVC from falling into the jug, and the holes at the bottom of the 5 gallon. It's crude, but effective; the peppers and squash have done really well with it the past 3 seasons and I don't see why melons would have any problems. If you do it let us know how it goes!
