[1.10.2] How to Replace/Add to Vanilla Item Models/Textures and Potion Questions

[Jedispencer21]

What I am trying to do is change the texture of the potion, but only for my potions. How would I do this? I tried using setCustomMeshDefinition, but getModelLocation never seemed to be called. Also with potions, is there any way to increase/decrease mob spawns while having a custom potion effect active?

[Jedispencer21]

for the increasing/decreasing mob spawns, I would think it should only affect the player that has it active, and it would change the spawn rates within a certain range.

[Jedispencer21]

Mobs spawns would change in the chunks that are nearby to the player that has the potion active.