A person must definitely drink clean water, but not 2 liters, but at the rate of 30 ml per 1 kg of weight. The fact is that water drives water. New water will remove the old, stagnant fluid from your body, thereby purifying it. But you cannot drink boiled water, only bottled water, which contains trace elements necessary for a healthy body
I came across advice from a fitness trainer, which, in my opinion, is quite reasonable. She recommends drinking enough so that the urine is lemonade-colored. If the color of urine is already like that of apple juice, there is little water in the body, and how much water a particular body needs to drink for this is strictly individual.
In order to understand the veracity of this theory, it is enough to get as close as possible to the world of Nature, which comes from animals, plants and people. In many ways, the trouble of humanity lies in the fact that, living in the conditions of the 21st century, in an attempt to take care of health, we forget about the laws of Nature. Watch the animals: they only drink water when they feel thirsty. They do not know about the concepts of "daily rate" or "2.5 liters of water per day." The same can be said about the plant world: if you fill a pot with a flower with water daily and abundantly, then you would rather kill it than benefit, because the plant will absorb exactly the amount of water that it needs, and the rest will destroy it. Therefore, the answer to the question "to drink or not to drink?" will tell your body, whether or not feeling thirsty. I would like, however, to clarify: all of the above referred to healthy people with moderate physical activity and living in countries with a temperate climate. Breastfeeding mothers, pregnant women, children, athletes, people at any stage of the disease constitute a special category where drinking really stands out - but that's another story.
This is all strange. Why doesn't this vary based on a person's weight, diet, and lifestyle? Why should the amount of fluid consumed by the body be regulated not by the body itself, but by some settings? A person needs to be guided by the amount that the body asks for, making you feel thirsty, because this is all individual. No need to drink water forcibly, measuring each milliliter with a beaker to fulfill some daily norm.