it depends. you don't want to over dilute and get a dilute negative.

did you test your self on the first void of the day? if your line was faint on the first void, that means you are below the 50ng c/o using your most concentrated urine. using a full dilution may not be necessary, and unless you follow it to a t, you could end up with a dilute negative.

if you tested on your first void, try another home test closer to test time, say, 5 days before, after drinking 20 oz of gatorade 1.5 hours before you test. drink no more than 40 oz in the 3 hours before the test. then test yourself, and see where you are. if you get a nice line, follow the same regimine before the real deal

48 hours before the real test, load up on the red meat and creatine supplements. The day of the test, have some salty foods, ramen noodles, mcdonald's fries, whatever, to make sure your SG and creatine look good.

if you want to, you can get strips that test SG and creatine, so that you know that if you are passing with 20 oz of gatorade, your SG and creatine are good too. you have plenty of time to order more test strips from ebay and some adulterant strips.

practice does make perfect