how much water should you drink a day

There is no single daily water requirement, but general guidelines suggest about 15.5 cups for men and 11.5 cups for women from all food and drink sources.

Total fluid sources. Total fluid intake includes water, other beverages (like milk, tea, and coffee), and water found in foods, which provides about 20% of your daily needs.
Factors influencing needs. Individual needs fluctuate based on physical activity, climate, body size, pregnancy or breastfeeding status, and overall health conditions.
Practical hydration cues. Drinking when you feel thirsty and monitoring your urine to ensure it is a pale yellow color are practical ways to gauge hydration.
The 8-glasses rule. While the 8-glasses-a-day rule is easy to remember, it is not a strict scientific requirement and may be more or less than what an individual actually needs.