Here's the model file. If you look at the bottom of the bottle you have both the curve that I used for Network as well as multiple separate edges that were created by the closed curve.

If I use the original curve and make it planar, I can't Join it to the rest of the bottle. If I use the newly created edges, I can make it planar and join it to the bottle, but the separate edges seem to make a funky Fillet.

Thanks,
David