Would be hard... At least if you search for realism.
I vaguely recall that this topic have been asked in the old forum. Worth a search. Perhaps search for dripping, too.

This is exactly what I am trying to achieve
http://www.youtube.com/watch?v=KO5KKqwCyos

If you look carefully you can download PDF's from both these pages:

A method for real-time rendering of water droplets taking into account interactive depth of field effects (2002)

Rendering of Water Drops in Real-Time (this may be in german, but it also has opengl source code)

I think these might help you.

Thanks amnon.owed