how can i make fluid or water inside bottle

how can i make fluid or water inside bottle like in this video https://www.youtube.com/watch?v=KGEbtLCf7tU

Edit: I have tried hard, but unable to start it anyway, what i find from google is

Search Result :

http://answers.unity3d.com/questions/54982/is-it-possible-to-make-liquid-water-in-unity3d.html

https://forum.unity3d.com/threads/fluvio-fluid-dynamics-for-unity.95255/

http://answers.unity3d.com/questions/475028/how-do-you-put-liquid-in-a-bottle.html

http://answers.unity3d.com/questions/1237815/how-do-you-simulate-a-liquid-inside-a-bottle-using.html

But didn’t get any help from these searches.
Plugins are available on the asset store but i want to make my own physics of water simulation inside the bottle.

Any good technique of making water like in the tutorial??

Any kind of help will be appreciated.

You could try to make a model in blender. There are many tutorials on YouTube but I dont know if its really ‘fluid’ after importing it to Unity. I dont know if it works but you could try.