Adding water may not allow an instant test (& sometimes labs too) to see that you are dirty, but it will result in an "invalid' test where you'll either be considered dirty anyway or asked to retest. If the concern is about a chemically based drug, then try Baking soda. I'll give you the guidelines:Females … Read more

I'll have to agree, do not allow tainted urine to mix with clean urine. If you do not have enough clean to fill a bottle, then do whatever improvisation necessary to make it as if you missed the bottle or spilled some or whatever, just don't mix them! You WILL come out dirty! I was … Read more