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Just adding my two cents...

You can often get away with flipping an image vertically to create a passable rendering of a reflection, but usually it's not really "accurate". In the illustration below, you can see the top surface of the cone in the original, but you cannot see that top surface in the reflection.  Similarly, you cannot see the bottom surface of the cone in the original, but you can see the bottom surface in the relection. (Try this yourself by holding a real object up to a mirror.)  An accurate reflection depends on where the viewer's eye is positioned relative to the scene.

In your wine bottle photo, you can slightly see the top of the bottle cap, so therefore you should not be able to see the top of the cap in the reflection because the eye of the camera is positioned above the top of the bottles.  And everything IamSam has discussed above is also in play. In my opinion, truly accurate reflections can be fairly difficult.

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