Preheat oven to 200 degrees. Line two baking sheets with parchment paper.
In a large bowl, combine water and lemon juice. Add apple slices and allow to soak for 15-20 mins. An optional step, but this will reduce browning.
Remove apples from lemon water and place on a paper towel. Press another paper towel over the top to remove excess liquid. Place slices on baking sheets and sprinkle on spices like cinnamon, if desired. Bake for one hour.
Remove, turn over slices, and bake for one more hour. If you would like crispier apple slices, bake for up to 30 minutes to an hour additional.
Notes
To store: Keep the dried fruit in an airtight container at room temperature in a cool dark place for up to one week. Dehydrated apples that are crispier and no longer have moisture in them can be stored longer.If using spices, remember that a little goes a long way. You can play around with flavors like pumpkin pie spice, cinnamon, apple pie spice, or even citrus zest.Thin slices of fruit will dry quicker while thick ones will take longer.