screw the kits get the drink it works great man i've used it before, and you have to stop smoking 2 days before the test drink the drink an hour before the test and your good to go... look for the brand QUICK FLUSH
don't oversaturate your body with water your urine will look weak and color and they will know that you are trying to "cheat" the urine test they do get mad and will even tell you to come back for a retest