Get a bottle of synthetic urine, get a big old coffee cup with a lid. Stick the urine in the bottle in the big old coffee cup. Practice before hand to see how long you have to nuke it for. You should have a microwave somewhere there at work. When its at the right temp stuff it in your shorts. Practice doing it as calmly and quietly as possible. And remember you don't have to pee on command. If things aren't right just stall and say you can't pee. You're getting paid by the hour anyway. Milk it. Make the process as expensive as possible for the companies.