I have always drank mineral water in my travells.
In many hot areas I've noticed chest freezers for bagged ice sometimes have frozen gallon jugs of water for sale. I set it on the seat beside me. Bitter cold liquid (gaseosa burns on the way down) brings an "AHHhhhhh".
In humid tropical areas bottles of hydration beverage for sufferers of diarrhea can be had with flavors. Apple is my favorite. The drink is not inexpensive but the next overheated perspiring drive, try it...for me it's like getting a blood transfusion. Tired and cranky becomes refreshed and smiling. It's from replacing needed minerals.