The conclusions are great: drinking when we are thirsty, or in short, when the body demands it.

In fact, when one said that the body is made of water, my impression is that this is more an abusive form of language than anything else. There are indeed water molecules in one's body, as you said it, although strictly speaking, the water present in the body is not there under its usual form as mixed with other stuff in the body fluids. I really enjoyed reading your post. Made me thinking about something :)