title: Creating 2D liquid with SpriteKit
body: <p>What's the easiest way of creating a 2D liquid surface in SpriteKit? I don't mind using any external libraries.</p>
  
  <p>So far I've used LiquidFun by Google and LiquidKit - a folder I found on github.</p>
  
  <p>This is the effect I want to create. Fluid that fills half the screen:
  <a href="https://j.gifs.com/m8aQ5X.gif" rel="nofollow">https://j.gifs.com/m8aQ5X.gif</a></p>