I rarely drink water but I do drink a lot of tea over the course of a day. It's fluid intake that's important, not water as such.
We do take a bottle of water if we're out walking especially if the weather is hot, but I wouldn't carry one as a matter of course. I rarely feel thirsty (and never have at any age).
My bowels and kidneys seem to be working fine.
I, too, think this incessant water sipping is just a fad. And all those plastic bottles are an environmental disaster.
Help! Need boring recommendations for movie


