I keep a water bottle on my desk too, and its mere presence does wonders for staying hydrated. Non-routine days where I'm away from my desk and not drinking as

I keep a water bottle on my desk too, and its mere presence does wonders for staying hydrated. Non-routine days where I'm away from my desk and not drinking as much water sometimes leave me feeling a little parched by the end of the day, when I'll have to make up for it before going to bed. A funny thing I've noticed is that I tend to grab for the water bottle most frequently when I'm mentally chewing on something. I wonder if this is just a plain old habit or if extended mental activity increases water requirements...