Always Neutral.
...
Always Newt-ral.

On a more relavent (and less cheesy) topic, there is just a thing as axiomatic water. I belive it's either in the Planar Handbook or Manuel of the Planes. Someone correct me if I'm wrong.

In short though:
Holy Water: Fortified with Positives!
Unholy Water: aka. Hell's Toilet Water
Axiomatic Water: No isotopes here!
Anarchic Water: Boston Tea Party, anyone?