The amount of ice you'll need for your portable cold tub depends on a few factors, including the temperature of your source water and how cold you want your ice bath to be. As a general guideline, you can follow a 1:3 ratio of ice to water. Your Chilly GOAT GO! holds about 120 gallons of water, which means you would need about 40 gallons of ice. However, if your water is warmer or you prefer a colder plunge, you might need to adjust the amount of ice accordingly. It's an easy and flexible way to get the perfect chill!