Will water mess up your engine if it is put in your gas tank?

Will water mess up your engine if it is put in your gas tank?
all it will do is kill your engine if alot of it gets sucked up by your fuel pump, or else it will cause your exhaust to appear a little bit white until all of the water is burned off.
but if you want to remove it, use seafoam which you can buy at schucks, napa, or autozone, or just put a bottle of rubbing alcohol into your gas tank and run it.