First.. here is a decent read about Southern Arizona and our lovely desert:
http://sarci.org/safety.htm
(From our Southern Arizona Rescue Association)
Table of Contents
Prepare For The Unexpected And
Emergencies
Carry Plenty Of Water And Drink It
Beware Of Flash Floods
Do Not Hike Alone
Tell Someone Where You Are Going
Avoid Cliffs And Waterfalls
Be Prepared For Cold Weather
Carry Proper Equipment And Use It
Learn Key Outdoor Skills
From the desert museum
http://www.desertmuseum.org/center/edu/faq_desert.php