I enjoy at least 8 glasses of fresh, clean drinking water.

Enjoyment is the unlikely half of it. Eight glasses is a chore. A cold glass of water when you are genuinely thirsty is one of the plainer pleasures available to a person, and it costs nothing.

Most people drink water the way they answer email: grudgingly, in arrears, after the headache has already started.

Try the other order once. Fill the glass before you want it. Notice the ring of condensation it leaves on the desk, and that you finished it without ever deciding to. Bodies are not subtle about being given what they need. They just say thank you quietly, in the form of an afternoon that didn't fall apart.