While you can get away without a fridge or cooler and still eat well, you need water. And if you are unlucky, your Jeep may need water as well. We typically take at least 5 gallons along on a weekend trip. This Hydra water bladder is like a Camelback on steroids. It holds 2½ gallons of water and is designed to attach to the rollbar or seat back as shown here. It doesn’t take up even half the space of a 5-gallon jug, and we can always get water right from the driver’s seat, so we don’t have to stop to refill a water bottle all the time.