From my Gale research I gathered two biographies regarding hikers in Zions Canyon and the Grand Canyon. Both groups thought they were adequately prepared for their day hikes, but proved to show that the unexpected can happen. The first story, Wanderers in Zion is about four hikers who get separated from their church group while hiking in Zion. They get so lost that they encounter BLM land. Between the four of them they had one 32oz nalgene of water. They ended up having to spend the night outside and were eventually rescued by campers. The narrator talks about how he was sure that they would die of exposure or dehydration before finding their way back or getting rescued. The second story is less extreme, but still proves the point of the importance of having water when involved in outdoor recreation. It is part of 300 Travel: Walking Across the Grand Canyon. Scott Carrier and his son attempted to hike from one rim of the Grand Canyon to the other, and back. They ended up having to take a longer time than expected on the trip because they overestimated the impact the weather would have on them. Carrier describes the rocks of the canyon like a toaster oven because they held and gave off heat. There is very little shade and even if you can cover the distance of the hike in a day, it is still deadly. The heat and exposure will leave you dehydrated or suffering from heatstroke. These stories heed warnings of exposure and hydration preparation and how without them, it can mean death.