(Assuming the shower is running. Any temperature.)
The best I could come up with was a hot soup, but eventually you'll get more water then broth. There has to be a better food out there for those hungry showers!
You take care of that part later, I guess. The whole point of the shower orange IMO is to go primal on it and tear it open and chow down without concern for mess or eating it efficiently. Leaving the peel to pick up afterwards probably just gives the rest of your shower a nice citrus aroma.
More like… take the orange, with the peel still on it, into the shower. Dig your fingers straight through the peel deep into the center of the orange, and then rip it open. Smash your whole face into the middle of the orange, shoving the sweet insides into your mouth and not caring that much of it is smearing on your face. Then shower normally… no sticky residue because you’re already in the shower and it washes right off.