I've actually used mine quite successfully as a humiditiy source inside of a humidor.
I've turned a S&B surplus ammo crate into a humidor for my cigars. Bought cedar fence board from Lowes, cut it all to shape, lined the inside of the box, sealed it with caulking so its all air tight. Got a nice little thermometer and hygrometer from wally world, and lastly used the russian oil bottle for holding water.
Its pretty ingenious. I cleaned out both sides with varsol, break cleaner and finally dish soap with plllleeeennntty of water until it was clean, with no smell whatsoever. Filled with distilled water and glued inside to the cedar.
When humidity is low I uncap both sides, when its high I cap them, or leave 1 uncapped. Seems to be working great and its a totally mil-spec humidor now!