Rema-D*Help

Okay, so I've smoked for years now, and everytime I've had a piss test, I've passed with flying colors. That's only due to the fact that the piss test was either a take home test, or I could take it whenever.

Now, this job requires me to take a test within the next three days.
I plan on drinking a lot of water, and urinating a lot.

I also went to a tobacco store and bought a Detox drink:
"Rema-D Dietary Supplement, Passion Splash Punch."
Says maximum strength and I'm assuming it will work.

However, I was told it only works for about five hours. So I plan on drinking it about an hour or two before the test, and drinking lots of water afterwards.

Until then, should I keep it refrigerated, how long will it take to start working..etc.

Basically, asking a little more info on this product and asking what I need to know to pass the test.