Aaaahhh water :)

I agree with @agmoore's comment. This blog is a great way to shed light on water as a solvent.

On an almsot non-related note, I also played a bit with water this year to illustrate simple electrostatic properties. As water is an electric dipole, we can make flowing water react to charged Ebonite (hard rubber) or glass sticks. Look for "Bending water with static electricity" online. You can find really cool stuff ^^

Cheers!