How do you maintain/clean a copper water bottle?

Answer 1

To clean copper bottle from the inside: 

1. Just squeeze half a lemon into the bottle.
2. Add 1 tablespoon of salt and 1/2 a cup of water in it.
3. Close the lid and shake the mixture thoroughly. 
4. Pour this mixture out and rinse the bottle with fresh water. 

That's it, your copper bottle should look as good as new!