Many people believe that refilling a water bottle with “just water” poses no risk but health experts say this assumption is wrong.

New research published on a medical website reveals that even the bottles we use every day can become breeding grounds for harmful microbes.
Experts warn that regular and deep cleaning is essential to avoid potential health risks.

Germs accumulation

According to the research, bacteria and fungi easily transfer into bottles through our lips, tongue, hands or even the cap. The inner lining, bottle holders, straws, and tubes are common spots where germs accumulate and stick.

Experts say bottles made of glass, metal or plastic can all become contaminated if not washed regularly.Plastic bottles are slightly more vulnerable because scratches on the inner surface allow microbes to settle and survive.

Daily cleaning is essential

Experts recommend thoroughly washing the bottle — inside and out — with warm, soapy water every day. It must also be dried completely before refilling, as moisture helps germs multiply.

A weekly deep clean is also advised. If the bottle is dishwasher safe, experts suggest placing it in the dishwasher. Otherwise, scrubbing with a vinegar or baking soda solution is recommended.

If a bottle is used for protein shakes, sports drinks or sugary beverages, daily cleaning becomes even more important.
Sugar and starch inside these drinks act as a food source for bacteria, encouraging faster growth.

Experts strongly advise against refilling disposable plastic bottles. These bottles can emit chemicals and develop scratches that trap germs.
Any bottle showing an unusual smell or discoloration should be emptied immediately.