"Jstwannapass," I've never used QuickFix, but I've subbed clean urine five or six times in my life. As a woman, it's a bit easier to sub than it is for men.

I filled a plastic icing bottle with urine. They're tube-like bottles. I assume QF comes in its own container, so go with that

Put the bottle beneath your crotch and then pull on a pair of tight undies. To be doubly safe, also wear a pair of nylon stockings or tights. A loose skirt will make it impossible to see any bulge. Unless your test involves a pelvic exam (it won't), then you'll be able to go hours with the container between your legs. Your body will keep the QF the proper temperature.