Prior to your test drink alot of fluids.(Gatorade,cranberry juice,Tea.even water)
Start about 2 hrs before you go.drink 16-20 )z every half hour.
Piss a few time before.And when taking the test.Piss a little then piss in the cup.(you want to use about midstream)If you didn't smoke for 30 days you should be fine.
Sub with a clean sample from a friend if you can trust your friend??
Or Get some Quick Fix 4.0
http://www.detoxforless.com/pass-a-d.../fake-pee.html
Quick Fix will work as long as its at temp.