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Starting with Sphere Hexahedron, deleting half, and scaling it flat. Using extrude to build the height of the bottle, bevel to add radiuses, and loop cut where geometry is needed. Taking the loops that were cut and scaling them down to match the profile of the reference that we set up.
When adding thickness all the details on the outside are added to the inner side too. Using edge dissolve where it is needed to remove the extra geometry in order to allow the inner side of the object to be more realistic.