When you’re rendering refractive materials, make sure that your liquid and bottle are watertight meshes, also liquid should be ever so slightly larger than inner surface of bottle mesh and bottle should float above table just a little bit. If those conditions are met, then Corona should have no problems to render physically plausible result.
you also need intense environment lighting, if surroundings are black/dark so will be reflections & refractions
also check for number of light paths and bounces, too low values can produce black/dark areas
edit
oh… and normals, overlapping geo, double verts… blablalbla …
otherwise, comparing with references is looking good
You can try to change absorbtion distance and/or rotate/change HDRI to find from where those dark spots are coming, but to be honest, your result doesn’t look unplausible to me.
