Since several people asked how this freeze drying works, I did some homework last night. First off, let me just say this is not exactly a cheap hobby. Not as expensive as horses, but a bigger layout than just fabric. The money saving part comes in when you buy groceries on sale and make double batches. One to eat and one to freeze dry.
You cut your fruit into smaller pieces, or pour your casserole onto the trays in a thin layer. To make the process shorter, you put it in your freezer on one of these trays and freeze it first. Then you place it in the machine where it takes it down to -40 degrees (yup that a minus), then it heats the bottom, turning the ice into a gas (least that's the way they described it) which freezes on the walls. It removes absolutely ALL the water while leaving 95% of the nutrients and flavor.
Dehydrating and drying food is a completely different process, with an end result nowhere near as tasty or healthy.