This is how often you should really be washing your water bottle - doc says it's not actually every day
Briefly

Dr. Jason Singh emphasizes the hidden dangers of bacteria in reusable water bottles, suggesting frequent washing is essential to prevent harmful biofilm formation.
Dr. Singh states that when you sip from a water bottle, you are engaging in a 'microscopic exchange' with bacteria from both your mouth and the bottle.
Research indicates reusable water bottles can host bacteria levels up to 40,000 times that of a toilet seat, highlighting the need for regular cleaning.
Experts recommend washing water bottles with soap and hot water every two days to disrupt bacterial biofilms and maintain hygiene.
Read at New York Post
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