I do the SWF (Salt-Water-Flush) if all I'm drinking is OJ, but once I introduce soup, I stop. I think some people continue to do the SWF (Salt-Water-Flush) that extra day - it's up to you.
You can drink the lemon drink as well as the OJ (at least, I've never heard that you can't) but I am usually so sick of it by that time that I don't.
I always dilute the OJ because it is really too strong otherwise. One time I didn't and it was too much too soon.