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In the pre-op gastric sleeve diet, you can do a low calorie gatorade (G2), Powerade 0, Crystal Light, diet juice (juice that has less than 30 calories for an 8 oz serving. Ocean Spray makes several varieties of diet juice and many of theirs have 5 calories for an 8 oz serving.
According to pre-op diet guidelines by Oxford Radcliffe Hospitals, you should drink more in the hot weather. Remember, your aim is to drink at least 2 liters of fluid on a daily basis, and you need to drink at regular intervals throughout the day.