Inspired by Keith and Playing with water drops.....
Setup was done with my 50D, Sigma 150mm F2.8 Macro lens and Canon 580 EXII.
Flash was mounted off camera and pointed at a gold reflector behind the water bowl.
I suspended a zip lock with 3 glasses of water in it over the water bowl and made a single pin hole in the bottom, this gave a steady stream of water droplets and meant I didn't have to drip them with one hand and trip the trigger with the other. It also meant I was able to bold a pointer at the place the water was landing, and focus on that manually.
Shot on Fully Manual, F9 to F11, 1/250th, ISO 100. Camera was tripoded and the Flash was camera right.
I didn't have gel packs to color the light, so I shot on Flash WB for the green one (The bowl was green) and on Tungsten to get the blue one.
