How can I help out the ghost?

Hint 1 of 4:

The first thing you need to do is find a container for him.

Hint 2 of 4:

Any of your empty flasks will work.

Hint 3 of 4:

Now you should look for a body for the ghost.

Hint 4 of 4:

Surely you've seen something that's supposed to look like a person.