Potion looks like colored glass bottle when I use my resource pack

Question

If I use my resource pack in Minecraft, potion looks like colored glass bottle. My resource pack adds extra textures like coca-cola texture that works with CustomModelData. Also my coca-cola texture is colored too.
This is code in json file:

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

Answer 1

Don't make the bottle the overlay, just the liquid inside it.