A spoonful of what?

I remember when watched Mary Poppins for the first time.
I was about six and at repeated begging my friend finally let me watch her copy.
There is a part in the movie where medicine is handed out. At each spoonful the children say what flavor they taste, Poppins announces her flavor is "rum punch."
I remember I was wary of Poppins after that announcement. I figured she must have been an alcoholic if she wanted rum flavored medicine. I figured once Jane and Michael were asleep she would break open her bottles and drink till she passed out.

I still think she probably did that.