Distilled water w/ bittering agent

[T.G]

Originally Posted by SilverFox

After 2010 it will be a requirment in the US as well so many coolant producers are ahead of the curve. Also if you purchased your distilled water at an autoparts place (either that or deionized is recommended for coolant systems) it might contain the bittering agent.

Damn, that sucks.

Coolant actually tastes pretty damn good.