>>2861406MirrorWater for sloshing around (not great, will not necessarily work), WaterParticle_v1_32_64 for splashing (WaterParticleすべる用; at least in MMM, the effect works only when moved itself, but you can attach it to the character's leg or something and copy-paste an up-and-down loop for as long as needed), and maybe some other water-related effects that I haven't worked with from BeamMan (query: ビームマン 水エフェクト) or Soboro. Fluid Simulator is probably better, assuming you can make it work how you need.
