Don't take it to apple yet!! Since you seem to have been able to open up the machine, you can check if the logic board is working or not. There is a chance it could simply be your keyboard and power button are fried since there wasn't much liquid. Apple will charge you a $755 flat fee to diagnose and fix the issue, when you can diagnose it yourself and maybe fix it if you know someone handy. If you take off the bottom of the laptop and take a look at the logic board, you'll see two larger "silver pads" that are usually directly above the keyboard connector which is near the bottom left of the board (if the battery is oriented to your bottom right) You first want to disconnect the keyboard cable by lifting the small latch up and gently pulling it out. Then, If you use a fork or something similar to short one or both of these "silver pads" (which involves simply touching them, for me I only had to short one) and your logic board is intact, the machine will turn on. it is quite an interesting phenomenon. This...
if you take a look at the question I posted you'll see a picture and I explain it. Not sure if your board looks the same as mine but usually they are larger than the other and looks like silver pads.
