Well, let's see. You might be out driving somewhere, and become thirsty.
If that ever happened, I'd head home, and not go to a fast-food drive-thru, to purchase the watered down crap they sell. Besides, none of them carry caffeine-free Diet Pepsi, which is what I drink. Most quick stops don't carry it either, so when I travel anywhere farther than an hour from home, I bring a cooler and a bottle of soda with me. But I usually never get thirty, and even if I did, I'd pop a Brach's sugar-free cinnamon hard candy into my mouth.