How long would it take to?

Well as bad as it sounds I did a little pot last sunday. It was my first time and I only did one or two hits and had a little buzz. I'm currently trying to get a job and I'm wondering how long will it take for my urine to be safe for a drug test. I might have an interview next week some time and I haven't thought too much of it before now. Are there any ways to get clean before or am I okay because I only did 1-2 hits and really didn't get effected by it. I drink like 5-7 liters of water a day. I'm not sure if that myth is true but just wanted to add that! Thanks :)