Spray away!

A repurposed spray bottle (washed well) has become some of Q's favorite work lately. She enjoys spraying her table, letting it soak a bit, and then wiping it dry. She also asks to wash patches of the floor, chairs, and other surfaces around the kitchen.
While this is a fun activity for her because it involves water, it also does a great job of exercising the muscles in her arms, wrists, and fingers as she squeezes the bottle.

Once she has gotten more adept at using the bottle, I'll teach her to spray window glass and use a squeegie and rag to clean up the water!

This could also be adapted for the bathtub or even outside play!