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Good bants.
I drank 8-12 litres a day when working in 40C weather in Northern Australia. Usual work day involved hiking 18km with about 12kg of geophysics equipment.
Ate a salt rich diet so didn't bother with electrolyte drinks. Would urinate maybe three or four times a day, usually straw coloured so wasn't dehydrated.
Had regular access to a water tank on a vehicle throughout the day. Without this the work would have been impossible. Pic related, project vehicles after camp pack up.