By Michelle Hogan

Freeze-drying food involves extracting water from food, not conventional freezing. Removing the water from food keeps it from spoiling for a long time and reduces the total weight of the food. This is why freeze-dried food is preferred by hikers, astronauts and others who need to carry food but don't want to carry a lot of weight.

Strawberries are ideal for freeze-drying because of their high water content.

Step 1

Wash your strawberries by rinsing them in cool water and then drying them thoroughly on a clean kitchen towel.

Step 2

Remove the stems and slice the berries thinly.

Step 3

Place the sliced berries separately on a paper plate and then place them in a zip-style freezer bag. Press the air out of the bag without squishing the berries and seal the bag.

Step 4

Put a layer of dry ice on the bottom of your cooler or five-gallon bucket. Always wear gloves when handling dry ice.

Step 5

Place the bags with the berries on top of the dry ice. Stack the bags on top of each other if you have to.

Step 6

Replace the lid on the cooler or bucket, but don't seal it tightly. Some air needs to escape while the dry ice is evaporating.

Step 7

Seal the lid completely once the dry ice has evaporated. You can now keep the berries in the cooler or bucket with the lid sealed tight, or store it in a cool, dry place.