Thanks everyone for the comments on yesterday's shot!
The way I shot these was actually in my bathroom (wish I had a proper studio!). Tripod, flash, release cable, glass container and water dropper were used. The best idea is to have the water dropper suspended high and fixed, like a ladder. I had mine stuck to a pole. That way, you don't have to worry about where the drop will hit each time, and just worry about the timing!