Interesting idea, using the old to a new ends.
Frank’s photo reminds me of a cheese grater.
My choice is a common enough item, one that comes in a variety of sizes, can be refilled with its original substance and transported with ease. Useful on a long journey if you’ve got a dog , handy in case you also get thirsty on a trip.
In the past, one was used with a frisbee as a watering station for our hedgehog visitors.
Today though, it has joined one of my £10 dash Christmas gifts and is hanging on the guttering outside. Already we have had a couple of scouts testing the merchandise!