Write the next sentence in the following story.

How to build different types of solar ovens and dehydrators
Decide how it will be used.
Will it be used for a hobby or is it for actual family food preparation? Emergency situations can occur anytime and without warning. Being able to prepare food is one of the primary survival skills everyone should know, at least the basics to sustain life.
Determine the size unit you need for your purposes. The larger the unit, the more food that can be cooked.