If your toddler can’t reach the faucets just grab an old shampoo or lotion bottle and cut it the way you see in the picture. Stick it in your faucets and it will make an incredible faucet extender for your kids.
If by the end of the days there’s more cups in the zinc than in the shelf, this is a fun solution. Stick some magnets to a plastic or paper cup. That way you can put it in your fridge door. Your kids will love it and they will always use the same one.