How to rename my default tiles?

So, while working on my game, my default white tile got renamed to "water". Not really sure how it happened buuut it's causing some problems for me haha.
I made a replacement "white" I can use but now I have to go back and replace every single instance of "water" with "white" and it's proving to be a bit annoying. And I don't just want to replace "white" with "water" in my code because then it might become confusing.
Any tips on how to fix this?