No, don't add water to it.
Been looking at this enviro-kool stuff. The company also makes Thermogreen (
www.thermogreen.com, of course!). No idea where I'd get some though, but it says that it performs better than all Glycols. It still won't match water though...
This stuff seems to be made by a company called Clearwater (
www.cwichem.com). They have an office in Houston... they have a phone number in Houston... hehehe They make products for oil drilling (drilling fluids). I work for an oil drilling company... hehehe
Gotta go!