If you want a low temp liquid coolant get some CO2. Before you flame me saying CO2 doesn't exist as a liquid stop and listen. CO2 isn't a liquid at atmospheric pressure. But inside a gas cylinder like what they use for softdrinks it is a liquid. How much pressure are we talking here? About 70PSI. But if you can get your hands on and old soda fountain you could easily make a one shot vapor cooling rig. Just make sure to keep a window open because too much CO2 in a room will make you kinda light headed.
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