You forgot to mention that DHMO is a major industrial solvent, a nuclear reactor coolant compound, a strong greenhouse gas contributing to global warming, and known to be corrosive to several metals. There's also a syndrome known as "DHMO Intoxication", caused by ingesting too much of the substance, symptoms of which include dizziness, vomitting, swelling of the brain, and eventual death.

Seriously, it's pretty dangerous stuff.