Hello. In all honesty water drop photography is something you can achieve with the simplest kit. Camera, tripod, flash. If you have these three things you can get good results. However, should you require more control there are devices such as sensors, delay timers, solenoid valves to make it all nearly automatic, other than tripping the shutter.
I ran a quick search for glimpsecatcher and it seems like a homebrew timer delay based around arduino circuitry.
There are commercially available devices such as the camera axe
http://www.cameraaxe.com/wiki/index.php?title=Main_Page and others. Some have the option to buy as kits or whole units.
But in all honesty, unless you require the amount of control needed to produce a perfect shot, every time then stick to existing kit.
One quick set up would be your camera on a tripod near the sink, fill the sink and manually focus on the water that's hitting the now full sink. Set your camera to say two seconds exposure and say f8 to start, and have your flash set at 1/16th
Turn out the lights, get the tap to drip press the shutter. fire your flash manually when you feel the time is right.