Although I am a newb to the board, I believe that the consensus here is that you should use either the substitution method, or dilution.

IMHO, assuming that you have clean urine, which you can purchase a synthetic product, or if you have a clean donor, susbtitution is the best way to go if the test is unobserved. Your main problem with the substitution method is ensuring that you have the correct temperature, and making a smooth transisiton from you concealed container in to the drug testing cup. Both of these problems can be addressed with a lot of practice. Read the substitution sticky and you will find a wealth of info.

For dilution, it seems to me that it is more dependent on your own body's physiology, and following the correct procedures. Creatine levels and other factors can make it so that even if you follow the procedures, you could over dilute and have to take the test again. However, the dilution sticky has a great set of instructions.

If you have the time, you should order the test strips and experiment.