I just carry a half gallon thermal jug with me all the time. Hiking or not. If my mouth feels the slightest bit dry, I need to drink more water. I tend to piss clear, or very pale yellow cause of this, but the upshot is that I was fine wandering around Anzo Borrego national park, and two of my friends (who thought that my idea of covering myself head to toe in jeans, a trench coat, and a trilby was a bad idea,) damn near got heatstroke. I basically threw my water at them when I noticed they weren’t sweating anymore.