Quote:
I use either one 1-gallon milk jug or two 2-liter soft drink bottles. I swap these out daily. In a 48 qt. cooler, this keeps the temp ~60 degrees nearly all the time. The air is "very damp" inside the cooler, also. Using small 16 oz. bottles or open containers of loose ice will most likely melt too quick, and let the temp rise beyond desire.