I have done the spray bottle several good pumps followed by a thumb over the mouth and a good shaking, and pouring out into the starsan bucket. That being said I got a bottle rinser/ vinator for Xmas and it makes life that much easier faster.
You pump the sanitizer in the bowl from the central stalk into the bottle. It squirts a stream the size of your pinky into the bottom of the bottle, now at the top while pumping. It returns to the bowl it's attached to.