u/fizziebutter

So I'm trying to design some merch and I really like this liquid ripple design and would like to use something like this in my work........but i'm kinda clueless on how to actually make this.

I tried using a texture effect on some lines drawn by the brush tool...but it's just not the same

I can draw something like this and trace it with the pen tool, but i'm just wondering if there's a more efficient way for this?

Also I'm kinda new to this so please explain like i'm dumb(cuz i am)