There was a movie I watched when I was only a kid, can't remember much but it was about a robot/alien who can take a child inside him, and let the child control him.
I only remember a scene where they are by the lakeside and kid was exploring the robots features, like he can piss(sorry about this) without getting out of him, and kid asked for food, they found a hamburger (dunno where/how they have found it) and robo thing grinded it, made it fluid for kid to eat.
All I remember is these. I assume it was from 90s or 80s.
It has been on my mind for a long time but can't remember any other thing about the movie. Would be nice to watch it again. Help would be appreciated !