BOULDER, Utah - By Day 2 in the blazing Utah desert, Dave Buschow was in bad shape. Pale, wracked by cramps, his speech slurred, the 29-year-old New Jersey man was desperate for water and hallucinating so badly he mistook a tree for a person. After going roughly 10 hours without a drink in the 100-degree heat, he finally dropped dead of thirst, face down in the dirt, less than 100 yards from the goal: a cave with a pool of water. But Buschow was no solitary soul, lost and alone in the desert. He and 11 other hikers from various...