Aside from using a wort chiller or placing the boil kettle into ice baths, has anyone used something like half-gallon milk jugs, washed, filled with water, frozen, sanitized, then put right into the wort to cool it down? I'm struggling with cooling down the wort with tap water that's over 80 degrees here in sunny Orlando in the summer, and placing the kettle in a tub of water with ice gets the ice melted quicker than the wort can cool. Good idea/bad idea?