Can working in excessive heat 12hrs a day 80-130 degrees cause diarrhea? how much water is needed during this time & is a potassium supplement needed

Hydrate hydrate!: Everyone is different as far as how dehydrated they will get under different conditions and how acclimated you may or may not be to those conditions. Under normal situations 48-64oz of water a day is necessary for most adults to stay properly hydrated. If you are in extreme heat, adding an electrolyte solution (Gatorade like) is a good idea. Drink enough that you urinate several times a day.