I have a friend who is a girl the same size as you,maybe few pounds lighter. She can pass a piss test in 24 hours doing nothing but drinking water. Too bad we all aren't like that. But everyones different and detox kits tend to be unreliable. It depends on how important passing the test is. If its extremely important then synthetic urine is the best way. If its a job offer you're not worried about getting or not a detox drinl might be worth a shot.