This is a really tragic story, and I've enjoyed the comments that have been posted. Does anybody have any ideas about what he could have done to survive this situation given the supplies he had?
Probably the only thing that I would have done would be to hole up during the day and hike at night (If at all). There's probably some scrub brush, so there's probably a minimal amount of shade. If he had a way to dig, maybe stop an hour or 2 before sunrise and dry and dig a shallow ditch to get to a bit cooler dirt. Otherwise, I'd pretty much avoid any desert survival situation!