As a general rule, it’s advised to drink at least 8 glasses of water per day. While for most, 8 glasses of water is enough, others will need to drink more, especially if they are outside in the heat or exercising. Ideally, men should aim for 3.7 liters (15.5 cups) of fluids per day, while women should drink about 2.7 liters (11.5 cups) of fluids daily. If you want your body to function well, you need to continuously replenish the fluids you lose through sweating, urination, and breathing. The amount of water a person needs can vary slightly based on various factors, including age, weight, activity level, general wellness, and current weather conditions. For instance, individuals with chronic health conditions, such as kidney stones, may need to increase their fluid intake. In addition, women who are pregnant or breastfeeding need additional fluids to stay well-hydrated.