Tip for filling spray bottles with Star San: put the water in first, and then add the Star San with a measuring spoon. That way it won't fizz up while you're trying to fill the bottle. Be sure not to add too much Star San; don't just pour it in, *measure.* I remember hearing the manufacturer of Star San on a podcast say that adding too much is as bad as adding too little.
I have gone from filling entire carboys with Star San (wasteful of both Star San and water, plus awkward) to doing a lot of spritzing or at most relying on a gallon or two of sanitizer to do the job. Before bottling, I sanitize the spigot, put it in the (clean) bucket, put a (sanitized) baggie over the spigot with a rubber band, add a gallon of Star San, and push the Star San through the (clean) autosiphon. The tubing I use to transfer the wort to the bucket becomes the tubing I attach to the bucket and the bottling wand.
I don't use Iodophor because it stains and because I read somewhere that Star San is easier on the environment. I may be wrong on that last point, and if so, I am sure I'll find out very quickly!
You didn't bring up bottling (yet :-) ) but I find a Vinator sanitizer filled with Star San (again, put the water in first) is the easiest way to sanitize bottles; I drain the bottles in a clean dishwasher. (I have a not-safe-for-forum nickname for the Vinator which other lady brewing friends find hilarious.)