The “faint odor” of the urine that you sense is caused by lack of liquids. When you don’t drink water or other liquids, the urine is more concentrated and consists of more urea. When you drink a lot of water, the urine is more diluted and contains less urea. You could try drinking enough liquids to make sure you're hydrated and pay attention to what happens to the faint odor in the urine...it will probably pass. But if it does not, or you feel concerned by your amount of water intake, consult your physician.