One suggested treatment for a person who has suffered a stroke is to immerse the patient in an ice-water bath at 0°C to lower the body temperature, which prevents damage to the brain. In one set of tests, patients were cooled until their internal temperature reached 32.1 °C. To treat a 68.0 kg patient, what is the minimum amount of ice (at 0° C) that you need in the bath so that its temperature remains at 0°C?