The day of your test you want to get a 5 hor head start and drink water as much as you can handle, you will start pissing clear, everytime after u piss drink water, keep doign this till you test, 2 hours before the tes take 3-5 b12 for color. Very important 3 days before your test raise your creatinine level u can do this by taking creatine suplements or eat lots of red meat but its easier for some people to take sups wich u find at GNC. The creatine in your system will lower suspicion that you diluted. No use on drinking lots of fluid days before the test, just the day of your test if possible try to excersice but stop 2 days before test.
PS. TAKE 4 ASPIRIN 2 HOURS BEFORE TEST IT MIGHT MESS WITH THE TEST
GOOD LUCK