https://www.thegnomonworkshop.com/tutorials/liquid-simulation-in-houdini

Simulate milk pouring into a bowl of cereal to learn the art of interacting with Rigid Body Dynamic objects and FLIP Fluid Particles. This 3.5-hour workshop by Stavros Sofianos will teach you how to craft a dynamic, art-directable splash effect, filling the bowl with milk and allowing your cereal pieces to float. This tutorial is created for intermediate-level artists with a basic understanding of Houdini.  Stavros begins by creating various layers of cereal and placing them in a simple yet effective way that will allow you to create a pleasing splash interaction later using the FLIP solver. You’ll also explore a Voronoi fracture technique to correctly create proxies that can be used in an RBD simulation to generate the initial state of the cereal in the bowl.