Just bought some today... DAP Silicone bath & kitchen waterproof ect... $5.68 at lowes. I love your idea too.. Depending on the size of the water dish you can Silicone just about any PVC/Plastic barrier that sits about the same height so it cant be spilled.. Take a walk around the Plumbing Section near Toilet Drains so the PVC Pipe Circumference is bigger than sink pvc, at least like a (6") pvc Coupler.
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