The amount of water you should drink daily varies based on factors like your health, activity level, climate, and body size, but general guidelines exist:

• For healthy adult men, about 15.5 cups (3.7 liters) of fluids per day is recommended.
• For healthy adult women, about 11.5 cups (2.7 liters) of fluids per day is recommended.
• These amounts include all fluids consumed, not just plain water, and also account for water obtained from food

Other guidelines suggest:

• The NHS recommends aiming for 6 to 8 cups (about 1.5 to 2 liters) of fluids daily, including water, milk, and sugar-free drinks

• The Institute of Medicine’s adequate intake (AI) values are about 13 cups (3 liters) for men and 9 cups (2.2 liters) for women from beverages alone

Factors that increase water needs include:

• Physical activity (more sweating means more water needed)
• Hot or humid climates
• Pregnancy and breastfeeding (which increase fluid requirements)
• Age and health status

A simple personalized estimate is to drink about half an ounce to one ounce of water per pound of body weight daily, but this varies by individual needs

. In summary, a typical healthy adult should aim for roughly 9 to 15 cups of total fluids daily, adjusting upward with increased activity, heat, or special conditions like pregnancy