The branch and copper divining rods actually work. I put a well on my property almost 6 years ago. The old guy who did the actual clearing of the land offered to help me find water. He brought a "live" wishbone-shaped switch and we started looking. We get a very strong response around a huge oak tree. Afterwards, I ordered some copper dousing rods, and double checked the spot. Both rods were twirling around in circles. So, I call the well drillers out. Head guy hops out of the truck, and he's looking for a missing copper dousing rod. I offer him mine, he checks the spot, and then starts triangulating the area to be sure.
"Yup! Right here."
They hit water at 40' and drilled to 120 for storage. Awesome water, too.