Dehydrating puree food

There are any number of home dehydrators available commercially, such as the Nesco FD-75PR. I have one like this and it works well. However, as Alton Brown demonstrates in this excerpt from Good Eats, a dehydrator for fruit can be constructed quickly and easily as well.

[Edit] In the video Alton demonstrates using a typical box fan, home AC filters and inexpensive plastic mesh, all bound with a couple of bungie cords to create a simple, but effective, dehydrator. If the video remains down you can also find it on You Tube by searching for "Alton Brown Fruit Dehydrator". (thanks for the update @Aaronut)

Brining is a process that hydrates...or forces liquid into the cell structure of the product...to slow or prevent dehydration. This would certainly slow your dehydration step, perhaps dramatically. Adding extra water and then eliminating as much as possible doesn't seem to make sense. Why not just dehydrate less in the first place?

Basing my thinking on the quick method for rehydrating dried beans, I would suggest using boiling water...or stock (maybe hard to come by on the trail)...to speed rehydration.