DoDMERB Remedial Question

I got called back for a Urinalysis without Microscopy, and i know that I'm not supposed to be having a whole lot of protein or be working out a couple days prior. My appointment is next Wednesday and I'm going to make sure that I don't workout and that I drink a lot of water starting a few days before...but is there anything else you guys would recommend? I really want this to be the only time that I have to go back.