Is it possible to make water similar to Terraria's in Godot? How?
2D Water Like Terraria's?
I think it might be a form of cellular automaton.
http://www.jgallant.com/2d-liquid-simulator-with-cellular-automaton-in-unity/
Oh, that's pretty cool.
Can I make a standard TileMap do this? Or do I have to create a custom plugin node?
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Honestly not sure what the best route is. That's something you would have to potentially experiment with for your self. But a good first step would be to make a google search and see how others might have gone about it before.
Here's the first resource I came by: https://github.com/tterrasson/liquid-simulator-godot
It's a plugin built in c++
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I made a similar test project to experiment this as well, using GDScript https://github.com/Zylann/fluid2d_demo
@Zylann Your example is fantastic, is it possible to make the water interact with RigidBody2Ds?