Never tried one per se but I did do the same thing with a flashlight and bottle of bug spray by accident once. Worked like a charm (actually it worked well, charms don't work at all). I'd bet it's effect is mitigated by the type and colour of bottle you use but I've been impressed with my squishy bowls which are also made by Guyot Designs. They seem to be a cool company thinking up new ways to solve old problems.
But for the record I thougt of it first.
