The Jug is Awesome!
The hike in is simple. You just follow the old jeep trail until it pretty much becomes level with the creek. Then you start heading down stream in the creek. I've done the Jug many times and I don't recall the 20 ft falls that azrocks is talking about. That doesn't mean it isn't there; my definition of a falls might be different than his. The rappel is no big deal at all. When you reach it the anchors are on the right-hand wall if you are looking downstream. They are about at chest level. I would bring a length of webbing and a rap ring; the anchor is usually just bare bolts. There is another anchor on this wall that you have to walk on a ledge to get to. I don't think it's anything to get excited about, but I wouldn't recommend it if you are not comfortable with heights. The possibility of slipping off the ledge is very real!
I have never put a harness on for this rappel. I don't really consider it a rappel. It is more of a rope-assisted down climb. If the water flow is strong however, I would rappel. The swim at the bottom is probably close to 100 yards; maybe 70 or 80 really. You might know this already, but I would put my gear for the day in a dry bag, and put the dry bag in a pack that I don't mind getting wet. Make sure the pack has a waistbelt. The pack will act as a flotation device. If you don't have a waistbelt however, the pack will push your face into the water.
The Jug is one of my favorite places in AZ. The water-sculpted rock is mind blowing. With that said, please don't litter, and try to pack out any that you might find. Have Fun!