Or maybe “four to eight” cups. The idea of drinking almost 12 liters of water each day is pretty amusing.
It makes me wonder how some people don't seem to recognize, that we as a species have been on this planet for quite some time now, and that IS the greater part of out existence on this planet when compared to how long we've studied science and medicine of today!
The timeline of either is heavily weighted on the side absent of anything we would call "modern." :-)