Make it with bottled water with some quinine, rather than the tapwater you normally would.

This page explains it:
http://www.chm.bris.ac.uk/webproject...nteresting.htm

A couple years ago, I had a link for a place that sold several types of bottled water that would glow different colors under UV. I think the site I heard about it was talking about doing a mad scientist thing. It was way cool, so my browser lost it.

I want a hearse.