Maybe you can get a hint or two from these lessons that involve liquid:
Ocean in Session: https://cgcookie.com/lessons/ocean-shading-lighting
The Dew Droplet in Sessions: https://cgcookie.com/lessons/dew-droplet-shading-lighting
Bodies of water from Shader forge: https://cgcookie.com/lessons/bodies-of-water-introduction
And alternatively you can check superhive for shaders and products: https://superhivemarket.com/
