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     How much water should you drink each day? It's a simple question with no easy answers. Studies have produced different recommendations over the years. Although no single formula(配方) fits everyone, knowing more about your body's need for fluids will help you estimate how much water to drink each day. 
     Water is your body's main chemical element. It makes up about 60 percent of your body weight. Every system in your body depends on water. For example, water carries nutrients(营养成份) to your cells, and provides a good environment for ear, nose and throat. Lack of water can lead to serious problems. 
     Every day you lose water. For your body to work properly, you must meet its water needs. So how much fluid does the average, healthy adult living in a moderate climate need? Studies show an adequate intake(摄入) for men is about 13 cups a day. For women, it is about nine cups. 
     Everyone has heard the advice, “Drink eight glasses of water a day.” This rule isn’t supported by hard evidence. However, it remains popular because it's easy to remember. Just keep in mind that the rule should be changed to: “Drink eight glasses of fluid a day,” because all fluids add up to the daily total. 
     You don't need to rely only on what you drink to meet your fluid needs. What you eat also provides fluid. On average, food provides about 20 percent of total water intake. But water is still your best choice since it is inexpensive and is everywhere.