Every pound on a spacecraft raises the fuel consumption at liftoff. Eliminating as much weight as possible is important. Because the fuel cells on the space shuttle produce water as a byproduct, water is easily attainable. Therefore, taking foods that can be rehydrated with this water makes sense because dehydrated food reduces the amount of weight on liftoff. In this activity, students can have a fun experience as they rehydrate instant pudding and instant drink mix.