But many people freeze dry food without a machine, and there are two ways to do that. The easiest way to freeze dry food is the one that also takes the longest. All you need to do is place your food in small pieces on a tray such as a cookie sheet, or a cooling rack or air drying rack and simply put it in your freezer.
Freeze drying removes moisture from food through vaporization, which turns water molecules into. How do I freeze dry fruit with it being edible without water
What it means is that as you freeze dry your food all moisture and water content is. Such foods are fruits and vegetables, e.g. apples, pears, berries, even potatoes
Freeze drying is the preservation of food, flowers or other items by removing most. with dry ice, rather than purchasing or trying to locate a freeze–drying machine.. item you want to freeze dry, such as sliced fruit, flowers, wheat or other items.
Freeze Dry at Home: In response to an Instructables thread from 2009 that I ran. it there, I could achieve freeze dried fruit goodness in the back of my freezer.