Just found this recipe, thought I'd share it:
http://www.cgl.uwaterloo.ca/~csk/water.html

Nick Evan commented: :) +0

I never seem to have any soda ash around the house when I really need some though....

Also, is there a microwave version?

I think you can buy it frozen and stick it into the microwave.

I am not going to try it anyways..:D

The only way to serve water correctly to deserving guests!
You may want to add a drop of crude on top and serve it BP style!