Bit of a weird one, but I think about this often as I tend to find myself drinking whole glasses of water a few times a day instead of sipping at my desk.
The advice always seems to be to sip water throughout the day to not "overload" the kidneys, but if you think about it, when we were hunter-gatherers we would likely have drunk water where we could get it, or would have stopped every so often and drunk, which would have also been the case when we were on our feet more either in or out of the home. Sipping all day every day is only easy if you're sitting at a desk, which is a pretty recent development.
Similarly with animals - I've had pet cats and dogs, and they drink a lot in one go, a few times a day. Wild animals seem to do likewise, and visit the "watering hole" or other water source specifically to drink. This doesn't seem to overload their systems.
AIBU to think it's fine to down a glass of water a few times a day rather than trying to spread it out, and that our kidneys will manage?