Small Engines (Lawn Mowers, etc.): ?water in gasoline, gasoline container, gallon of gas

Question
I put about 1 gallon of gas in the lawnmover model # 13A0672g129, It starts then dies.  I am afraid water may have gotten in the gasoline container, not sure.  I don't know how to get the gasoline out of the container.  Is there a hose/valve to drain the gasoline.  Everything was replaced a little over a month ago, except the fuel filter. Frustrated HELP

Answer
Follow the fuel line to where it connects to the carb.  Take it off there and drain the fuel.  Replace the fuel filter.  Remove the fuel cap when darning the tank, it will prevent a vacuum from forming in the tank.  While the cap is off check the vent in the cap too.