Water is essential for every cell in your body. It helps regulate temperature, transport nutrients, and remove waste. Most adults do well with about 6–8 glasses of fluid per day, though needs vary with activity, climate, and health.
Thirst is a late sign of dehydration; other clues include dark urine, fatigue, and dry mouth. Carry a water bottle, include water-rich foods like fruits and vegetables, and drink more when you exercise or when it’s hot. If you have conditions that affect fluid balance, your doctor can give personalized advice.
