Exercise and water intake

My surgery date is May 17 and have a question about exercising and water intake. Post-op water intake is just sips, but when I walk or ride my bike, living in Arizona, we drink water by the gallons, especially during exercise. Looking for any help on this as it's already heating up here and even on the treadmill in the cool house, I'm afraid I'll drink too much water. I'm thinking ice chips? Also, is swimming and water aerobics enough exercise for weight loss versus walking or riding a bike? Thanks so much for any help!!!

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