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Just do it.
I like to have a cooler in the car when we are on the road. It contains water and diet drinks.
I keep a cooler of watermellon. I eat it between jobs.
I always have water with me and on my open houses( and vacant listings). Leaving in SoCal you have to. Many years ago, I simply collapsed from dehydration. I got my lesson.
Keep water in the car, as well as some snack bars.
I spend a lot of time driving, showing properties in Tucson, AZ. I bring a Nygene bottle of ice cold water nearly everywhere I go, and fill it often.