I just made up my second batch. I used 1 capful of fabric softener and poured it into a spray bottle. Then I filled the rest of the bottle up with water. Give it a little shake shake and then spray 10 or so squirts onto wet clothes in the dryer.
I am still using this and it is working great. My main reason for using fabric softener wasn't really to "soften" my clothes. My problem was the crazy static electricity we were having. This has helped a lot.
I also just invested in some dryer balls which I will be doing a post on here soon.