In order to clean your copper bottle the best way, you can follow a few simple steps.
Step 1: Pour ¼th of naturally brewed vinegar in the bottle or use half a lemon.
Step 2: Add one tablespoon of salt.
Step 3: Pour one to two cups of warm water and shake the bottle thoroughly.
Step 4: Pour the liquid out and rinse the bottle with clean water several times.
You can use the same solution to clean your other copperware as well. It is advised that you refrain from using liquids other than water in your copper vessels as they may react with the metal.
***You should follow the cleaning instructions before using it and then repeat weekly.***