Mix 1 tsp of baking soda with 2 tsp of vinegar ... Rub softened tamarind over the water bottle, then wash nicely. Ketchup acts as a natural acid to remove copper stains. Spread some over the bottle, ...

or soda. These flavored drinks can create bacteria and residue. Over time, this can become mold or leave your water bottle with an unpleasant odor. As long as you know how to clean water bottles ...