Steve,if you have a fresh water tank odor, it's probably due to mold. You need to sanitize it with bleach. The standard method is to use 1/4 cup bleach for every 15 gallons of water. Fill tank, add bleach and turn on ALL water outlets until you smell the chlorine. Let set overnight and drain the next day. Refill with fresh water and run all water outlets until you can't smell the chlorine anymore. Drain tank and refill once more and run all the water outlets once more. Drain and the tank and all lines, faucets should be clear of any chlorine and/or mold.
Good luck
Ron