2 days until at-home test - have I done enough?

Long-time lurker and 1st time poster here. I've been doing my research and decided I'm going for dillution. Last time I smoked was around may 30th, then I found out my parents plan to make me take a drug test, either June 9th or 10th. I'm female, not skinny, slow metabolism. I have a vitamin B supplement with niacinamide and I've worked out the dosage I need to get the right color
I discovered where my parents hid the drug test strips and took a few for myself. The first 2 I did a few days ago were inconclusive - probably my fault. I took another after mowing the lawn today and it was positive, so my attitude right now is not good.
So, 1) are there any adulterants I could use to improve my odds? and 2) would it be worth the effort and grossness to drink vinegar to alter the ph?
thanks for your help!