The recommended amount of water intake for an average adult varies based on factors like activity level and climate but is generally about 2.7 liters (91 ounces) for women and 3.7 liters (125 ounces) for men daily. This includes all fluids consumed, not just water. Proper hydration is essential for maintaining body temperature, supporting cell function, and aiding in digestion. Thirst is a key indicator; however, it’s vital to drink regularly, especially during physical activity or in hot weather, to avoid dehydration, which can impair physical and cognitive performance.