Omg, some interesting suggestions here..
I was on probation for 2 years and smoked on and off the whole time while having to pass supervised piss tests.
thc is fat soluble, so you need to do everything in your power to burn fat. That means low fat high fiber diet, plenty of water (not because it's going to "flush" you out, but because your metabolism will operate better when you're fully hydrated). Jog a lot, and then jog some more. Cardiovascular exercise burns fat. Take a daily b vitamin supplement, this will also help your metabolism burn fat.
Don't waste any time, it's not on your side here. I used to give myself 2 weeks to get clean and would jog every day, or jump rope, or anything to elevate my heart rate for as long as possible.
a day or 2 before the test buy a drug test at walmart (or steal one if you REALLY can't afford one) and test yourself. It's not likely that this employer is going to invest much money into a sophisticated drug test. If you fail you have a few more options;
1. Really try to find someone with clean pee. Think of anyone you can. Do any of your friends have a significant other that doesn't smoke? No matter what anyone tells you, it doesn't matter if its from a girl or boy. Even if you're a dude and you get piss from a pregnant chick, it doesn't matter, as long as the piss is clean and as fresh as possible. If you have to store it for more than a few hours put it in the fridge and reheat it on your defroster in a condom on your way to the test. It needs to be between 90-100f or you'll fail. This is easily achievable if you hold the condom to your wrist, it shouldn't feel cool or hot but ambient against your skin. Make sure you're wearing baggy pants and safety pin the condom to your underwear above the knot you tied (condoms are pretty damn flexible so don't worry about it breaking, I've done it a million times it wont break). Pinned to your underwear against your inner thigh, any small temperature variation above or below 90-100f will stabilize to your body temp as arteries flow a lot of blood through your thigh, making it the best place for the condom.
2. Fake piss if you can find it in store. follow the same instructions as real piss
3. Sure jell from walmart (with the canning/jarring supplies). As cannabinoids metabolize out of your body they go through your intestines, where the walls of your intestines absorb the metaboloids into your blood stream where they are filtered out and eventually make their way into your blader/piss. Sure jell literally coats your intestines for a short time stopping the absorption of the metaboloids and allowing you a couple of clean pisses. But this method causes you do piss pretty much pure water with no color. take a b vitamin with the sure jell and it will turn your piss BRIGHT yellow, it'll look like you haven't had a sip of water. Google the instructions, I haven't had to use this method in a long time, so the amount of time before the test and how long you stay clean elude me.
You CAN pass this test. It's just a matter of how badly you want to. And please don't drink any bleach, ammonia, or piss..........