Quote Originally Posted by testee
thank you!

I suppose I shouldnt have any trouble using a bottle of that substitute urine you can buy?
No, not as long as its a reputable brand, unexpired, and had been kept away from direct sunlight exposure.

For peace of mind, you can always test the sub urine to make sure the creatinine, SG, and pH are all within satisfactory limits. These inexpensive test kits can be found online by doing a Google search for drug adulteration test kits.