Macbook Water Damage

Yesterday, I spilled very small amount of water on my aluminum macbook. It turned off, and it won't turn back on again. I removed the battery and dried the spill, and left it facing a fan overnight. Today, I put every thing back on and tried to turn it back on, but it won't. When I plug the charger it doesn't even light up (the small yellow light on the charger end). What should I do now? How much do you think it will cost me?

I am extremely frustrated because I spent months saving up for this laptop