Again, interesting! I know what you mean with this (for both food and water) and I can miss this aspect in all the health discussions out there. It's not so simple as to just drink or eat, we need to know that we absorb it as well.
Are you a health professional or just self-educated (not meant as a bad thing)?
I'm a holistic nutritionist and have been in the health and wellness industry for just over 10 years ... I also teach yoga, breath work ... Yes water it's an interesting one, so is food in general in a world where everyone can get on line and make something look appealing more and more people are following advice that confuses them ... I also am a firm believer and teach how to connect with your own body to see what it wants, needs and likes. Again in this day in age we are so bombarded with distractions that we are completely disconnected from our bodies!
Absorption is so important I see it with clients all the time taking a million supplements because they ready they were good but not educating them selves enough to know not only what their bodies need but also that some supplements counteract with other ones and it's all just a bug waste and can wreak havoc on the liver.