The "Ridge Walk" was the hardest thing I have done in a long time. We took 2 liters of water each per day. Even after refilling at the Water Barrel on the second day we still ran out of water due to the temp being in the 30's (unusually high). Do not underestimate the difficulty and take extra water. A GPS with the track pre-programmed is also highly recommended. All in all an awesome experience for all of us.