Wow, a test on Friday the 13th... FUN!

Drinking water in the days before the test does nothing to help rid the body of thc.

I would have told you to load up on creatine (at least 48 hours before) so your body would have time to manufacture it into creatinine, which will be lacking when you dilute. Take B2 or BComplex for color about 1-2 hours before the test.