How can i create "Puddle" game-like liquid physical particle system?

Hi.
I need some assistance in this question.
Of course I can use 2D Rigidbody to a particular group of objects but I need to get exactly the substance, similar to Particle System that would obey the laws of physics, being in the vessel. How can I achieve this?

Simple example from web:

 

There are a couple of asset store items that might get you started...

https://www.assetstore.unity3d.com/en/#!/content/5717

and

https://www.assetstore.unity3d.com/en/#!/content/23907

There's also Fluvio

https://www.assetstore.unity3d.com/en/#!/content/2866

 

Ohh! Thank you very much!!
I'll start with this.
=^_^=