DI water is not toxic, per se. It's just highly aggressive and will happily collect ions from your body as it reaches a state of ionized equilibrium. It won't kill you unless you drink enough for it to suck all the minerals from your body, but it probably will make you sick if you drink a significant amount. It's not toxic the way that ethylene glycol is toxic.
Anyway, any water is conductive once it's loaded with ions. And that means DI, distilled, RO water, you name it. Expose it to your system and it will pick up copper ions off your water block, copper off traces, tin off the solder, aluminum off your heatsinks, oils from your hand, dust from the air, anything from anywhere. It'll kill your system as fast as you can sneeze.
As for the freezer idea, it will not work. Not unless you only like using your computer for 15 minutes only, per day.
The purpose of a freezer is to evacuate heat. A freezer is not used to actively dissipate an active heat source. To understand what I mean, you must consider your computer and it's components as a heater. Let's say (conservatively) that your computer is a 50w heater. If you stick a 50w heater in a freezer and turn it on, you will melt everything in there and eventually, the freezer will be WARMER inside than ambient (thanks to the insulation). At the same time, the freezer will be running 24-7 because the thermostat says that it's too hot, and in a few weeks, the freezer will die from overheating the compressor.
Basically, a freezer doesn't have enough juice to cool a computer, no way, no how. You'd have to look into an active chiller. And I don't mean a water reservoir hooked up to a peltier, it won't work. You'd need a 1/2 hp chiller... and those START at $500 and suck a ton of electrical juice.
Neil
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