What is the best way to get rid of water from your gas tank?

O/K well here is my question how do you know you have water in you fuel tank?is you veh fuel injected or carburated? electric fuel pump or mechanical?year of veh?to the best of my knowlege the only true way to remove high amount of moisture out of gas tanks is to removed the tank it self and drain out fuel ,..if low amount of water are seen with little problems some times adding a full 16once bottle of rubbing alcohol it help water to evaporate ,..but in all means the best way to take care of the problem is to removed the gas tank and drain fully,..