Potion JSON messed up potion colors

I am currently trying to implement my friend's resource pack files into the server; however, it seems as tho it is broken. As seen in the attached file, he has it set so that if a potion is renamed to something else it will change the model/texture. The problem, however, is that all normal potions and water bottles have lost their texture, and they are just white now. any way to fix this? I'm assuming I know I have to combine that with this, i just don't know how to do it without it breaking:  
{
  "model": {
    "type": "minecraft:model",
    "model": "minecraft:item/potion",
    "tints": [
      {
        "type": "minecraft:potion",
        "default": -13083194
      }
    ]
  }