How does water bring personal physical freedom? What are the personal physical need for weather?

http://onlinelibrary.wiley.com/store/10.1111/j.1753-4887.2005.tb00152.x/asset/j.1753-4887.2005.tb00152.x.pdf?v=1&t=hqheqxdh&s=dacc2babddfb088516d2e3697fd7bb4423b5b367


The question I tried to answer is the first question, how does water bring personal/physical freedom? What are the personal/ physical needs for water?
At the beginning I think everyone needs water but I don't know why so I searched online at scholar.google.com. I found a source can help me to answer it. I think this source is reliable and accurate, because this source is find fromscholar.google.com.
First they said that water is the principal chemical constituent of the human body. And for people like me, there are 50% to 70% of water in our body. So I think water is important to people, we need to keep water balance in our body to keep our health.