I Duck Duck Go’d “child sink” “running water” and found both small water-recycling ones (like I’ve seen) and real portable ones which use separate input/output

I Duck Duck Go’d “child sink” “running water” and found both small water-recycling ones (like I’ve seen) and real portable ones which use separate input/output jugs. But you could of course dump back into input. Hopefully a good starting point, best of luck. You are a great parent, your child is lucky to have you.