Can you/how do you import custom models to entities? & I need help with Fluids

I have 2 questions:

Firstly, when I created a mob ( a Snow Golem variant ), I used the default Bipedal model for it, but it appears to me now that this distorts the vanilla snowgolem texture quite badly, but unfortunately there is no "Snow Golem" model available in the Entity creator. In fact, I can't even find a way to import models INTO the entity creator. I know that you can import them to MCreator, but there doesn't seem to be any way to actually use them? Am I missing something here?

Secondly, that said Snow Golem variant has a procedure that drops it's respective items at certain rates, but also, drops 1 block of custom liquid. However, after doing some testing, for some weird reason the liquid appears to delete items on contact, just like lava. I made sure that I selected "WATER" in the Fluid creation process, not "LAVA". The liquid has a Density of 100 and a Viscosity of 100, and a procedure that slows and damages entities who swim in it; nothing item-related. Any way to change this?

Oh, and if it helps, I'm using version 1.9.1 of MCreator.