That is awesome. Have you heard of the Boutenko family? They hiked the Pacific Crest from the Mexican border to the Canadian border on raw food. I saw a great video with the daughter, Valya, talking about how they got water out of a cactus. The book Raw Family went into depth about it too.
http://uk.youtube.com/watch?v=ZXmR13gKpdg #1
http://uk.youtube.com/watch?v=MPyf_Rv7Y48 #2
You have to watch through a little bit of an intro first.