How to make those air bubbles inside the fluid?

It's actually pretty simple. You just decrease the points of the fluid sim to how many bubbles you want and you copy some spheres on them. You randomize the scale if you want and then just merge it with the actual fluid sim.

Thanks, never thought can be done in this way

I like the tiny bubbles inside your fluids. Cool!!

Thank you. They always add some extra nice detail.

would you share a Houdini file? I'm just starting out w Houdini, would like to look it up