Have you run the hardware diagnostics yet (press D key at bootup)? Also try running Memtest for Mac. Another troubleshooting step to try is install macOS onto an external hard drive and boot from it. It will be slow, but you can eliminate SSD problems if you get the kernel panics running from an external drive.
Is it dark like the screen brightness is turned down to its lowest setting or is it completely dark like the backlight isn’t coming on at all? If it is completely dark then I would suspect that some water made it to the logic board. If the screen is lit up dimly, like the screen brightness is all the way down, it is possible that the F1 key got some moisture in it and is stuck. Seeing as how you said that the water was spilled near the delete key and that is where the screen LVDS connector is located, I’m guessing some water made its way to the logic board. I would say disassembly and drying is the first step.
I ended up narrowing down the problem to the panel. I removed the screen bezel and found that problem would come and go when I pressed the left side flex cable that connects the panel to the controller board. Note, I am not referring to the LVDS cable that connects the LCD to the motherboard. The problem is with the flat, orange flex cable that comes out of the panel and goes to the control board that the LVDS cable connects to. I ended up using some double sided tape to hold the flex cable in a position where the screen is consistently functioning properly. I'm guessing at some point I will just have to bite the bullet and replace the panel, but for now it is working normally and not exhibiting the problem anymore.
Sounds like the hinge mounting points on the LCD cover have broken. You will need to replace the LCD cover and the screen bezel. It isn't terribly difficult to do if you are comfortable with laptop repairs. You will need to remove the screen assembly, disassemble the screen assembly and transfer the panel, webcam, WiFi antenna, etc. to the new cover, snap on the new bezel and reinstall the screen assembly. Otherwise any PC repair shop can do it (not GeekSquad or Office Depot). Replacement parts are available on eBay, but in order to get new and not used parts the LCD cover would have to be ordered from Asia. http://www.ebay.com/itm/Genuine-Original-New-for-Samsung-Chromebook-XE303C12-LCD-Back-Cover-BA75-04169A-/161893684608?hash=item25b19d9580:g:l0MA... http://www.ebay.com/itm/New-Genuine-Samsung-303C-XE303C12-LCD-Front-Bezel-BA81-18198A-BA94-00007A-/182055535851?hash=item2a635b04eb:g:abgA...
They are both LG Philips screens, but the 2012 is part number LP133WX3-TLA1 while the 2012 is LP133WX3-TLA4. They are the same model, but different revisions so can't say for sure if they are compatible, but it looks like there are sellers online listing them as being interchangeable. It won't hurt anything to try it. If you can at least see the backlight come on then you know your original panel is bad and not the logic board. Odds are in your favor that it is the LCD and not the logic board anyway.