Two gallons in a workday??? I think that could make your brain explode.
i'm not a big water drinker, first off.
when working in Feen-X, i took two one gallon water bottles
with ice to work each day. started at 5 am.
first one had crystal lite in it. it was gone by 8 am.
second one was ice water. most of it was gone by quitting time.
about a gallon and a half of water in 8 hours.
now, i didn't pee till i got home, and was standing under the
shower, and cooled my core temp down enough. 6 quarts in
8 hours, no production of urine. wasn't sweaty either. it was
just going out thru the skin.
however, i was working in goodyear, arizona, at the snyders
of hanover pretzel plant, doing controls, and most days were
115~118 at that time. no swamp coolers, nothing.
it wasn't a dry heat, either. during monsoon season, six weeks
of living in a vegetable steamer.