So I have a shot in a project of mine where there is a bucket filled with water being carried and the water is sort of sloshing around, kinda like real water would. What is the best way to achieve something like this inside Houdini if time and performances (as in computer specs) aren't an issue?

You need to start with something and come up with a more concrete question like: My flip sim isn't filling the bucket of water or the splashing of my simulation is too large etc.

I'd personally try to use vellum fluids bc I just use it lately and haven't used flip solver in quite a while.