Alcohol

[Mark620]

Yeah but i assume the rest is mostly water, am i wrong ? (hint: i was *not good* at chemistry at school )
So put vodka in your coolant, and in the case of extreme colds and power outages (== no heating) you can still drink your PC coolant

You are correct it is mostly water. So if you want 50% alcohol and 50% water for your coolant. Use 100 proof vodka.