Best way to pass my drug test. please help. thank you

Ok so like three weeks ago or something like that i got busted by my parents which is a fun story but who cares.

my dad says that he?ll take me for a drug test sometime in the next month.

so i wanted to have something on hand to pass it but i dont know anything about this stuff.

what would be the best way to do this? and if possible, i?d like to be able to buy it at a store.

thanks

i would just stay clean. if you cannot go get a travel size shampoo bottle. clean it out real good, get the 3 ounce size. have someone piss in it male or female and save it in the fridge up to 3 weeks...if he home tests you..he probably will it is so much cheaper you wont have to worry about warming it. if you go to the clinic put it in the microwave lid off for ten seconds then hide in your whitey tighties.