How long do you have until you have to take the test, and how much do you smoke?
Cranberry is good. Lots of water and exercise also work well together. If you have to, you can drink a ton of water around 4 hours before your test, and you'll dilute your sample. In order to avoid raising any kind of suspicion about it, take some B12 supplements when you drink the water to add color to it.
Now, if the test is being done at a lab, then you may be in a little worse shape, as they may be able to detect that you've altered your sample. For this, I'd suggest using something besides your urine. Synthetic urine has always done the trick, but now some of the labs are being trained in how to spot it. If you want to be extra safe, buy some dehydrated urine, and follow the instructions that come with it.
"America...just a nation of two hundred million used car salesmen with all the money we need to buy guns and no qualms about killing anybody else in the world who tries to make us uncomfortable" — Hunter S. Thompson"Poison the well, your enemies are thirsty!" — Modest Mouse
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