Why are you passing up the promotion? Like Jeffman said, substitute! It doesn't matter who the company is performing the drug test and collection, they still have to follow the rules and laws on observation and a pre employment test cannot be observed unless you give them cause (temperature is wrong, refusing to empty pockets or take off outerwear, etc).

If you want to do it with your own urine and get clean, then buy some home tests.

I don't know what you mean by completely start over.

This thing about the portable water is crazy. It's dangerous and unproven. At least one of them drank lots of water before the test and that's what caused him to pass.

Most heavy smokers do not get clean in 48-72 hours.