There is 3 ways to pass a drug test.

Dilution. Substitution. Additives.

Dilution, you drink lots of water and dilute the sample so you won't have enough in your urine to be detected.

Substitution, getting someone elses piss, or even fake piss and using that instead of your own.

Additives, when you add something to make it clean. Bleach will work for the strip tests, but you aren't taking one of those so don't try it, it will mess with the pH level and you will fail. I don't know much about this method...you'd have to research.