Ah, now that I imagine would be possible, I was just thinking of how I would do it, but yes I have a feeling this is the best way of doing it.
I’m assuming this is similar as to what Valve did with Team Fortress 2 with the liquid in bottles such as in this video here https://youtu.be/AOeP57bpHa8?t=193 I’ve time-stamped it so it’ll show the liquid movement I’m talking about.
I don’t suppose you would know of a walk through that teaches you how to do this, do you?