I picked up one of these at Target last summer, and it was one of the best investments I’ve ever made! You can turn any liquid into a slushy in less than a minute. Store the cup in your freezer until the gel inside the walls of the cup is frozen (about 2 hours), pour any liquid into the cup, and then squeeze. That’s it! The longer it’s in there, the slushier it gets. You can also pick one up on Amazon.