Avoid caffeinated beverages like coffee, soda, and energy drinks. If you’re tired enough to need a chemical boost, pull over and rest, or catch a nap on a park bench or a picnic table, a practice LD riders call “checking in to the Iron Butt Motel.” Caffeine has another unwanted side effect. It’s a diuretic, which means it causes your body to excrete water through urine. The more caffeine you drink to relieve your thirst, the more water your body flushes away. You’ll need more time-consuming bathroom stops, too. Stick to plain water, and drink before you’re thirsty, not after.