Fitness depends on how much you exercise. If you do a lot of exercise, drink three mouthfuls at a time. Every time you feel thirsty, you can add 1 small mouth, but you can't add a lot of water when you exercise. Will increase the burden on organs. On the contrary, it is unfavorable. 1 bottle 600ML is enough. It's best to take a sip and replenish it many times. Don't feel thirsty. Remember not to gulp water.