Field goal attempts: unlimited. Splashing: also unlimited.
The Jool Baby Bathtime Football set has a goal post that suctions to the tub or tile and 2 footballs to throw through it. It keeps little (and not-so-little) players busy while you get them clean.
No batteries and no tools. The suction cups need clean, smooth, flat tile, so they won't hold on textured tile or regular painted walls.