I'll throw it on the printer and see how it comes out. Gonna use Carbon filled PETG, 30% infill with Gyroid pattern. With the gyroid pattern if you need more strength you can drill a small hole in the top and bottom of the part and pump epoxy resin in from the bottom and essentially make it a...
Give me a very accurate measurement of the diameter of the bottle. And an over all height of the shoulder piece. A very simple napkin sketch would do. I'll scribble something up on the CAD and show it to you.