If it's just a 5 panel cup test then you can just drink a fuckton of water a few hours before the test. Take some B complex vitamins too and drink a big redbull or another energy drink with b vitamins. The water will dilute your sample, the B vitamins make your pee bright yellow even if its watered down.
The 5 panel cup tests are also known as instant tests. They don't test for pH, specific gravity, or creatinine levels like the GC/MS lab tests. The only time they send off a 5 panel cup test to a lab is if you test positive, then the lab cofirms the positive result.
Google it for proof