"Why don't you start by importing the obj of that bottle instead of loading it as a prop. This way we have no texture or anything else loading with it, so we will see if its the geometry or the supplied textures that are not right."

How do I import one of the vases as an object?  Is the file an .obj file or something else?

"Lights, leave the mesh light as is, plug in an IBL light, I personally prefer the spherical ones this will give us the nice reflections in the glass."

By IBL light do you mean one of the IBL lights in Reality that look like a pool, etc?  Or is it the little IBL sphere that is under props?  I tried one of the ibl lights and it rendered a pool, so I'm figuring that's not it. I don't know what plug in an ibl light means either. I'm very new to Daz and Reality... but I guess that shows.  Thank you for helping!