I took a roxicodone (oxycodone) and 5 hours later took a 10 panel drug test i drank a lot of water will i pee clean?

Not likely: If you dilute your urine excessively (with a specific gravity of 1.003 or less, or a creatinine of 30 (some say 20) or less), your urine will be flagged as adulterated. It generally takes that level of dilution to reduce a substance to an undetectable level. Am more concerned with your using a (presumably nonprescribed) oxycodone tablet and being more concerned with test than with ? Drug problem.

Probably not: Five hours is more than enough time for the oxycodone to be absorbed and metabolized by the body, so your urine will likely show traces of the drug, even if you drank a lot of water. It also depends on the sensitivity of the drug screen. Good luck.