TexturePack/9/assets/minecraft/models/item/bucket.json

{
  "parent": "item/handheld",
  "textures": {
    "layer0": "minecraft:item/bucket"
  },
  "overrides": [
    {
      "predicate": {
        "custom_model_data": 1
      },
      "model": "item/bucket/schematic_show_private"
    }
  ]
}