Of course, water is useful and necessary for the body! The question of quantity seems to me not so unambiguous. The main thing is to maintain a balance, i.e. the amount of water consumed should be equal to the amount taken out. And the scientific views on this issue, in my opinion, have already changed and may change more than once.
You most likely and effortlessly consume about 2 liters of water per day, because food contains quite a lot of water.
Water is useful for a healthy body when consumed as part of quenching thirst. Those. wanted to drink - drank. Forcibly drinking 2 liters of clean water per day is most likely not required.
I recommend watching this video, which also discusses the emergence of the myth about 2 liters of water per day:
I don't drink much at all, even in the summer, but now I'm rebuilding myself because water is important for skin and bones. But you can't immediately drink 2 liters, the volume needs to be increased gradually