It all depends.. I was a landscaper in Phoenix AZ for a few years. Over the summer. We usually got to work ~5:00 AM and went home about 1:30-2 but it was still

It all depends.. I was a landscaper in Phoenix AZ for a few years. Over the summer. We usually got to work ~5:00 AM and went home about 1:30-2 but it was still extremely hot (regularly 113F or 45C) . I regularly drank over a gallon and half of liquid a day. And was still somewhat dehydrated. Drinking that much fluid a regular basis really starts washing salts out of your body... along with the sweat. You become very sensitive to amount of dissolved solids in liquid. Water starts being extremely unsatisfying at the days end but drinking salty stuff (Gatorade etc) at the wrong time (early morning before you really have drunk much) will really lay you out as it heats up.