Just search google or amazon for adulteration test strips. They will test your void with the same scrutiny the lab would. You will be able to see if you are within acceptable creatinine and SG levels while honing your dilution technique. BTW - you could do like the rest of us edumacated folk do and just sub Much more fun to continue to smoke with impunity than to worry about passing tests any more. The days of me sitting in a waiting room feeling like my bladder was going to burst are long behind me. But to each their own. It is a big leap of faith the first time. Good luck whatever you decide.