Sightseeing: Bring bottled water

There’s probably no travel accessory more underestimated than bottled water. Drinking a bottle (or even two or three) is sometimes the difference between conking out halfway through a hike and trekking 2 miles farther than you thought you ever could. It’s also a must at theme parks, for city strolls, and just about any place that gets lots of sun. And although you can often buy bottled water at convenience stores or museum or attractions shops, you’ll pay dearly—if you’re traveling by car, buy a case of bottled water at a discount store and keep it in your trunk.