If you did cocaine two days ago would you be able to pass a drug test by drinking lots of water?

First not doing it is a great way to keep it out of your system. However Cocaine will naturally leave your system in 2 - 4 days. It leaves so quickly because it is water soluable and is stored in the liquids in your body. These liquids are flushed quite often and they take the cocaine with them. One way to help this process along is to drink lots of water. It will dilute the trace amounts in your urine (assuming you are going in for drug testing and it is urinalysis not a hair follicle test) and help the cocaine to leave your system. Also, getting a cleanser might not be a bad idea. If you have only used cocaine once-ever-the cocaine itself will be mostly gone from your body after three days. Trace amounts might be left, however, depending on how your body metabolizes the drug, your body size, your sex, and the amount of cocaine you ingested. The metabolites your body produces from the cocaine will remain for up to several weeks.

If you're a habitual cocaine user, though, all bets are off. The cocaine has metabolized itself into your blood, urine, internal organs and even your hair. It takes much, much longer for all the metabolites to leave your system, and the drug tests test for not only the drug itself, but the metabolites.