How to make Fluid?

I’m working on a project involving a teacup… :slight_smile: Now I need to make the fluid inside the cup, tell me how to do it please!

Here’s the official documentation:

EDIT: Oh, I looked at your video, by the way - very scary! Did you put some kind of filter on it? If not, you may have pressed ‘Fields’ under the Render buttons. This makes it suitable for TV as opposed to PC, but gives it horizontal lines.

Okay thanks.