If you try the excessive water, be sure to take vitamin b-2 so ur urine won't look too diluted, labs consider that suspect and test for a lower level.
This is false. Samples that are determined to be diluted (due to low creatinine and specific gravity) will still undergo the same 50 ng Immunoassay for the initial screen as it would if the sample wasnt determined to be diluted. Only samples that have tested "non-negative" for a drug panel(s) on the I/A screen will undergo a confirmation GC/MS test with a lower (numerically) cutoff level.

And dont let the differing cutoff levels worry you. Although their cutoffs numerically differ, a 50 ng Immunoassay is functionally equivalent to the 15 ng GC/MS. Their cutoffs differ numerically because the I/A screen recognizes all 31 metabolite concentrations combined, while the GC/MS recognizes only one metabolite concentration.

THC enters the body in its ingested form and exits the body as 31 different metabolite concentrations. The most prevalent form of these concentrations is THC-COOH.

In order to pass the I/A screen the whole combination of the 31 metabolite concentrations must register below 50 ng/ml.

In order to test negative on the GC/MS, only one metabolite concentration (THC-COOH) must register below 15 ng/ml. For the reason that only one metabolite concentration is recognized, the GC/MS has to be set at a numerically lower cutoff level to make the two types of tests functionally equivalent.