How can you fix a laptop if water got on the screen?

Unless it's a really expensive high end laptop, you're better off calling it a loss and buying a new one. It is probably so damaged that the cost to repair it is more than you could buy a new one for. purchase a new lcd screen usually between 50-100$. After receiving screen in the mail remove all screws holding the laptop lcd bezel together carefully pull the bezel apart and unscrew the lcd from the brackets. Then carefully unplug all wires ran to the screen. Using new screen do steps in reverse and voila working screen.