There are lots of fruit trees that grow well in containers, and though you probably won't get quite as much fruit as if you grew them in the ground, you still might want to try to dry the fruit you harvest.

There are lots of reasons to make your own dried fruit--and apples are one of the easiest kinds of fruit to dry. First is cost--it's a whole lot cheaper to buy apples in bulk and dry them yourself than buying organic dried fruit, which can be pretty pricy.

To make it even more economical, I buy seconds from an organic orchard. The apples have small surface blemishes, but are otherwise perfect. Another advantage is that you can add flavors like a dusting of cinnamon and if you want to make sweeter apples you can even sprinkle cinnamon and sugar on the apples before you dry them. You can also dry apples that have lost their crunch and gotten just a little soft (it won't work if they are mushy, but a little soft is ok). However, you do want to make sure to cut out any brown or bad spots.

To dry apples, first wash and core them. Then you want to cut them into as uniform slices as possible. To do this, I either use a slicer attachment on my food processor, first coring the apples and then halving them before putting them in the slicer. 

My preferred method, though is to use a traditional apple peeler, corer, slicer. However, I don't peel the apples, so I lock the peeler back, so it only cores and slices the apples. 

Next I place the slices on a dehydrator tray--cutting enough apples to fill one tray--then when it's full, quickly putting it in a pre-warmed dehydrator set to 140 °F.

I don't know if getting them into the dehydrator quickly makes a difference, but it seems like they brown a little less if I do. When I'm loading up the trays, I lay out the slices so they are close together, but don't overlap. You can dip the apples in a water bath with lemon juice and/or citric acid, but I don't bother.

I let the apples dry for 6-12 hours. It depends on how think I've cut them, and how humid it is outside. To tell if the apples are dry, I touch them and look to see if they feel somewhere between leathery and crisp. I store them in a large glass jar with a top.

Honestly, they never last long enough to worry about long term storage. 

Review of My Favorite Dehydrator

Video on Food Dehydrating