The only way "detox" drinks work is by introducing liquid into your body, causing the level of drug metabolite in your urine to be diluted. You can't hide the drug metabolites with other stuff. Whether a detox drink might allow you to submit more dilute urine and pass by doing things like...
I was freaked as well, but I did a ton of research and figured out the truth. I recommend this article, it does an excellent job of surveying studies on the topic. The ultimate conclusion is that even for chronic users you are unlikely to test positive after 10 days...
You'll be fine. There are very few people who still retain testable amounts of THC after 4 weeks clean. I have smoked multiple times a day for years, I had to clean out for a drug test last summer and I started testing negative after 11 days.
I have to do this exactly, joined just to reply - virgin post here. The moving air required to control the odor as it grows drys things too fast during the cure. You can do it, but you have to have something to solve that problem. I recommend a timer that lets you pulse the odor control fan...