Drug test how long will it take

for me to be clean enough to pass a drug test just by drinking a lot of water?

how long will it take for me to be clean enough to pass a drug test by just doing nothing?

do the drinks that clean ur system, or give u a clean window really work and what should i get?

O ya to help ive been close to an everyday smoker for the past 2 years straight...

i need to kno this cause im trying to get a job, THANKS