Heat oven 225°F.
In a medium bowl, whisk together water, lemon juice and sugar. Slice apples into 1/4" thick slices, soak in lemon solution for 5-15 mins.
Transfer to GoodCook Crispy Baking Sheet, spray each side with a thin layer of coconut oil spray.
Bake for 2 1/2-3 hours, until slices reach the desired texture.
Note: they won't feel crispy until they cool.