The hold.
a caddy
a janitor.
porter
The train bearer
Patty Wagon
Both jobs are similar. One person carries the water, another carries the feed sack.
The thing in Apollo 13 that carries power and water is called the Lunar Module. It served as a lifeboat for the astronauts after an explosion damaged their command module during the mission.
That person can be described as having a fixation or obsession with that particular thing.
That would be a school crossing guard.
no noun is a person place or thing , call is an verb. a verb is an action word.
Protagonist