Things you need:
Water bottle cage
Grounding pipe clamp (available at your local hardware store)
Paint (optional)
Philips head screwdriver
Piece of aluminum/or steel strip, about 4.5 inches long and 1 inch wide
Drill with drill bit
Screws or rivets (and a rivet fastener)
Lock washer (optional)
1. Picture below (click to enlarge) demonstrates how to attach the water bottle cage to the piece of aluminum strip.