<s>[INST] How much water should a man between the ages of 18 and 25, weighing 90.6kg and with a height of 1.77m drink a day? [/INST] According to the Mayo Clinic, about 15.5 cups (3.7 liters) a day for men. Adjustments for size aren't given, but exercising, hot or humid weather, poor health, and pregnancy or breastfeeding are given as factors that might require more water intake.</s>