How long can i save urine for a drug oral exam contained by a container?

i plan on getting somebody elses urine and storing it in a glass container wrapped with aluminum foil, and sneaking it into the bathroom and pour the urine into the cup. if the wet temperature has dropped, then i will run hot dampen over the container. however, how long will i be able to store this urine before it "goes bad", or does it ever walk bad?
Answers:
Just drink the urine the night before, and pee it out for the interview.
Keep it in the refrigerator until the night before. Put it surrounded by a bag you can seal and tape that to your body so the urine is body warmth. From what I understand they usually check the temperature of the urine to be sure you're not cheating. Your aluminum foil and glass container model doesn't sound like the best one. They will hear the aluminum. They may also watch you urinate if you're masculine. If you're female they probably won't.

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