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Here's an idea. "They" make these sealing screws, used to screw down roofing, they have a screw with a concave washer and a rubber washer in there. The shape of the metal washer makes them naturally seal. They have a little hexagonal head, you can drive them with a nut driver or a ratchet with an extension. You put one of those in from the INSIDE of the bottle, and screw something onto the pointy screw-end now sticking up out of the top of your waterer, it can even just be a piece of wood you then stick a screw-eye or a hook into. Then you should have no leaks.
I like this idea, we have a lot of fairly useless little feeders/waterers around here, and this would make them useful.