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i spilled water on a closed screen and it looks like i i have water mark between the glass and main screen

While its possible to take the display apart it is not easy! And in the process you’ll likely damage a few parts in the process. Here’s the IFIXIT teardown: MacBook Pro Retina Display Teardown. While this is the 15" model its the same for the 13" as well. I would recommend replacing the full display if this is your first repair while the display assemble it more expensive to replace in the long run you’ll get a better repair. If you give us your model number we can can offer you more information.