are you testing for alternating current or direct current? ac or dc on your voltmeter. Any stray voltage will likely be alternating current.
I'm guessing that you were testing for dc, because if there was enough voltage there for you to feel a zap it would likely show up more significantly on your voltmeter. Also if it is simply induced voltage, like the article you posted suggested then it will be ac.
if you haven't already, then try testing for ac, both at the ground on the wall, and maybe the wet spot on the floor. If you get a reading, unplug your equipment 1 piece at a time to find the faulty piece.
And maybe where rubber soled shoes while you're testing.
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