How to do 2D water like in rpg game

Hello!

Sorry for my english, so I need water for my 2d second-person game, I just cant find something like
this

Thank you in advance!

 

I don't know 100% what you want, but there are some strategies discussed in these two threads:

Spritesheet animation: https://forum.unity.com/threads/bobbing-water-like-in-forager-game.1130164/
Spritesheet, vertex shader, and/or tilemap offseting: https://forum.unity.com/threads/runtime-access-to-unity-2d-tiles.1130446/#post-7264165

There's also shaders more generally. I can't tell what's going on in your picture (it appears as a single frame), so what kind of movement the water is doing I can't comment on.