Water Droplet

This evening I wanted to take an image of a water drop. Unfortunately. I did not have any useful gear for it. No external flash, and no strong light bulbs. I ended up using a LED flashlight to get at least some illumination. Not really happy with the results, but I like the shape of the droplet.

I decided to look for an used external flash. I am using a Nikon D90 and do not need anything fancy for now. Does anybody have any suggestions?