Hi Roger,

Sorry, I did not keep the construction (I am in a bad habit of deleting construction (in MOI V1), I need to get used to the fact MOI now has layers)

The main body is revolved (I made a spline from the edge/shape of the bottle, then revolved) I then cut a circular hole into the neck, copied the edge of the hole, trimmed and made blend to lines set at the top of the cutout, then trimmed away the rest of the cutout. The cutout edges where then merged.

The lip is made by Network (to make it one surface).