In this tutorial we create a liquid simulation in MantaFlow, we then add an object to scene and make it float on top of the water in blender 2.9
00:00 Object float on water result
00:30 Create Liquid Domain
01:30 Create base liquid flow
02:05 Create two additional liquid flows
03:21 Shrink-wrap plane on base liquid flow
04:26 Add effector object to float on water (MantaFlow)