There are plenty of ways to do this.
This one just crossed my mind first. Draw a polyline with Bezier curves. Draw a tube on that polyline with Pipe along a path. Scale down some of the sections and create a surface between them with Curviloft. The use round corner at the ends. Then play with the scale tool or FFD to achieve the desired result.
As for the other indents, just create some shapes that resembles them and intersect them with the body of the bottle.
bottle details.skp
[image: LRn2_bottledetails.jpg]