I'm not so bad now, but there was a time when I'd leave the truck for 8 hours or more. In summer I would have(2) 1/2 gallon water jugs in my backpack, another quart in each side of my cruising vest, plus another quart on my belt. That's in addition to my regular gear. By the end of the day, all of that water would be gone, and my clothes were generally drenched. Oh yeah, I also carried a soda bottle to fill at streams, to carry for my dog.Not a big fan of hot weather myself, but no way do I dread it.
I do miss the days when I could work that way though.