A freeze dryer is used when you want to preserve the life of perishable items past the expiration date by removing the water content from them and replacing it with gas. You can save money by building your own freeze drier at home. Freeze drying food at home is easy and takes little time to do.
Put the food to be freeze dried in the freezer bags, then remove the lid of the styrofoam cooler. The size of the cooler will depend on the amount of food to be freeze-dried.
Put on the leather gloves and place a layer of dry ice on the bottom of the styrofoam cooler.
Place the freezer bags with the food in them on top of the layer of dry ice. Do not stack the bags--put them side by side. Cover the layer of food with another layer of dry ice. Repeat until the styrofoam cooler is almost full and the top layer consists of dry ice.
Place the lid back on the styrofoam cooler and wait for 30 minutes. Check to see if the items in the cooler are frozen solid; if not place the lid back on the cooler and check every five minutes until they are frozen.
Remove the freezer bags with the food in them when they are frozen solid and place them in a regular freezer until they are ready to be used.
Keep the lid off the styrofoam cooler and set it outside to let the dry ice evaporate.
You can store the food items in a pantry if they were vacuum sealed in the freezer bags prior to placing them in the styrofoam cooler.