Years ago I used to meet up with girlfriends over breakfast, and we'd all sit and gab over coffee, and once breakfast was served and over with, it would be more coffee.
8-10 cups, and not even getting up once to pass all that liquid.
I honestly don't know how my poor tummy used to take it, because now, anything over 2-3 cups of coffee, my tummy aches and feels yucky from all the caffeine.
Same for tea, though tea doesn't seem to bother me anywhere near as bad as coffee.
I enjoy a cup of tea in the evening/after supper, and there are times where I'll tip back a half dozen cups of tea later in the evening and enjoy each and every cup immensely. Doesn't keep me up or affect my sleep whatsoever.
My husband, when outside working on a hot day will often go through two (sometimes more) litres of water in a few hour span, and he won't come in once to relive himself. He just sweats it out.
Like Ruth n Jersey, I, too, have drank so much fluid on a hot day and could feel it (and hear it) sloshing around inside me after.