How can you lower the risk of testing positive on a saliva drug test?

im gettin drug tested an dont kno if its goin to be from a urine or saliva test, an have been smoking marijuana almost everyday since the beginning of this year. my last day was about 3 days ago i stopped because my dad caught me with my supply that i was slangin but i told him im not smoking it so he said he was guna drug test me, so ive been drinkin hela water an been workin out every day an i sit in the sauna for about 30 minutes, any other suggestions on wat to do? an i cant get my hands on detox so mark that off.