The problem is that UNDER the laptop keyboard is the important electronics (the motherboard etc).
If the water has drained through to the motherboard you may have problems.
I would first STOP using it (electricity and water dont mix!)
I would remove as much of the laptop as you can (battery, CD drive, anything else) to let the air in.
Maybe dab it with a tissue to remove residual water.
As has been said, maybe gently blow warm air into it with a hair drier.
Leave it opened up, but upside down, overnight to let the water drain out, and dont use it again till the morning.