minecraft-expanded-datapack/assets/undeadm-m1/models/item/potion/love_potion.json

{
  "parent": "minecraft:item/generated",
  "textures": {
    "layer0": "undeadm-m1:item/empty",
    "layer1": "undeadm-m1:item/potion/love_potion"
  }
}