Eubber balloon

I want to make a water balloon wich expands as i fill it up with water or try to take the look of the object placed into it. Can i do this with cloth? I’m looking for ideas. Thank you!
(sorry for the broken eng :D)

Use morph targets, so you would have one pose of it without anything inside it and then you have one with it full and you can then set that as a target and animate between them.