Antifreeze is glycol based and will damage the pump/tubing and res. It's already been tried (by yours truly) before and it's pointless. Only time is was of any benefit is when you're going with a chiller. I used it when I had an air conditioner freezing a 5 gallon igloo resevoir and a submersible pump.
As for milk, juice or gatorade/powerade, never tried it. I know with milk it'll start thickening up and it will eventually clog the hell out of everything. Not to mention the smell of curded milk (yuck), lol.
JayzTwoCents always entertains me. I get a real good laugh watching his videos, lol.