The amount of water a person should drink daily varies based on factors such as age, gender, activity level, and climate, but general guidelines provide a solid starting point for most adults:

• Men aged 19 and older are recommended to drink about 104 to 125 ounces of water daily (about 13 cups to 15.5 cups).
• Women aged 19 and older should aim for about 72 to 91 ounces daily (about 9 cups to 11.5 cups).
• These recommendations include total fluid intake from all beverages and foods containing water.

Specific needs may increase for those who are physically active, live in hot climates, are pregnant, or breastfeeding. Children and teenagers have lower but age-specific recommendations. In summary, aiming for around 13 cups (104 ounces) per day for men and 9 cups (72 ounces) per day for women is a good guideline, but listening to the body's thirst signals and adjusting for activity and environment is also important.