The problem with heavy water is the fact its slightly radio active. They intentionally release it into pipes/caves and then use geiger counters to fallow the water and see if there is a leak in the pipe or were the caves goes.
The reason why water gets cold in a vacuum because as it boils it absorbs alot of energy to go from liquid to gas. Which is why you sweat, as the sweat evaporates you cool down. If you want to use this then try using a bong cooler.
If you want even lower temps from a bong try using alcohol, since it evaporates at a lower temp it gets well below ambient. Then your room will reak of alcohol though.
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