Put salt & lemon pieces (1 or 2)
Fill the bottle with water
leave it for 3-4 hours, then shake it well and discard the water from bottle
cleaning required once a fortnight.
What not to keep other than water!
Don’t use chemicals to clean the bottle,
Outside bottle is coated, hence not required to clean with a scrubber/ chemicals.
Don’t store other liquids other than water.
Don’t deep fridge the Bottle.