best way to fill a container with liquid/soap?

Earlier this year I began doing packaging design for the company I work for. I have been able to do the packaging quite easily, however I haven’t yet found a good way to simulate soap or liquid inside the packaging. Any input would be appreciated, thanks.

You could simply model the liquid

Or you could use the fluid simulator to fill the container

Ah, thank you. The first link seems to be exactly what I’m after.

Interesting read this first link, thanks!