I agree with Kent… I probably would have used 1/3 or 1/4 of the verts that he used and maybe half the steps since he used the subsurf after, but I likely would have used a cylinder as well. One detail I note he left out is that indention on the bottom every plastic and glass cup have.. but that’s probably just nitpicking, as you wouldn’t see it unless the bottle was animated and lifted up in a way that you could see the bottom.
Here, he used the modifier, but you could also use the spin tool in the T panel… the difference being if you wanted to adjust it, you’d have to make sure to select the entire loop and scale or move it rather than a single vertex.
If you want to fill it with water (or give it a glass or clear plastic material in general), you’ll want to add some thickness. The Solidify modifier would be good for that. Otherwise, it won’t look quite right.
