I need some helpful advice.

My friend scored me a job out in Alberta where the drug tests are basically at every job you'll ever try to land. Well I have 30 days or so to clean my system of any drugs which may be polluting it. I know I should exercise, and drink water / cranberry juice till my bladder explodes, and stop smoking all together.

However what is teh best flush kit I could buy just to be on the safe side? It's better to be safe than sorry, just because it would really suck to travel across the country for a good job only to be rejected before I started because of some weed.