Fruit pectin, you can find it in the home canning isle. I mixed one packet with some water and Tang powder (the orange drink, to make it taste better) , and it didn't even taste that bad. Then drink ALOT of water, both the night before and all that day. If it's a urine test delay the test as long as possible, and schedule it for the afternoon if you can. When you wake up, you will have a higher THC content in your urine so - get rid of it. lol I did this and passed a walmart drug test.