Needed to have some sort of active cooling that dirt cheap, so I picked up a 100w aquarium cooler. It sits on your hand, and is only good for pre-cooling the water. Its not powerful enough to keep up with my 50W laser running at 80% power continuous.
Good for precooling the water for a longer run than without the cooler. If you have access to the water container, swapping ICE pack will be more effective. For me, my water container is enclosed inside a hard to access rolling cabinet. I think best to make an access door for it.