Don't worry. Usually marijuana stays in your system about a week. If you did just 2 puffs, you gonna be clean 2 weeks later 100%. If you still worry about the test, drinking, sweating and exercising are good ideas. Lemon, zeolite, charcoal and aloe vera will not help. Try diuretics or detox drinks to urinate more. There are also few tips like urinating few times before test and giving the midstream for sample.
You can read more here: http://blog.best4drugtest.com/marijuana-detox-guide.html