Once the water temp hits about 75 to 80 degrees, I quit trying to keep them alive. I really like the single handle, 28 qt. ice chest from Wal-Mart with the hinges on the lid. 2 frozen 2 litre coke bottles will lay right in the bottom perfectly.
Also, this way, I can cool off and take a nap before cleaning my fish. I also agree that chilled fish fillet alot cleaner and easier.