Kristen,
I do drink water when I am out working in the sun. Almost by the gallon. But I spent a week in the hospital years ago with a severe heat stroke and my doctor tells me that each one makes it easier to have another. Not being a doctor, I have to take his word for it and it sure seems to be so. My nerves are so bad I don't notice that I am starting to lose it until any times I am actually having to lay on the ground to keep from falling. I tell you OLD AGE is NOT the GOLDEN years. I think I passed mine about 45 years ago. The only way I know if all of my parts are working is if they are hurting.
Ron