using and storing a clean sample

[Herbal Remedy]

First off, i take the really extensive drug tests, the ones that get sent to the lab after a guy has to watch me do my thing. My plan is to (once im completly clean, Im on my way) use someone elses clean urine, using the whizinator (the fake dick thing in high times) so noone can tell what im doing. i plan to have someone fill up a pretty big bottle (since i take 2 tests a week) and store it in the fridge until the morning of each test n such. The only thing im unsure of is will the test be able to tell that the urine is like a week or two old, cuz even though the first couple tests would be in reasonable time, the rest wouldnt occur until weeks later and i cant guarentee that my friend will be clean later on down the road. I dont think the test should be able to tell that its someone elses piss and the whizinator takes care of the temp. so i just gotta make sure that storing it in a fridge for a good amount of time wont cause me any problems or get me fucked. Thanks for any help, i really appreciate, peace...