Buy the blue Chillin Brew and put 2 in a cooler. If you put refrig cold water in there it will have ice chips in the water bottle when you drink. Only thing I’ve seen that will make cold drinks colder than when you put them in. Not the same as Yeti ice. Those suck. These things will freeze together the ice you cover everything with when you stand them vertical in the cooler, place drinks between and cover with ice. Or you can be all McGyver with some shit that doesn’t work as well.