It is normal for people to get up in the morning and drink water left overnight on the side table, in a bottle or a tumbler. Or sometimes we even gulp water from a bottle kept in the car for days. Drinking water from bottles, especially when you have taken sips directly by putting your mouth at the rim of the bottle, is not safe at all. That’s because when we put our mouth at the rim of the bottle, the dead skin, dust, and sweat covering our skin get backwashed in the remaining water. Even our saliva which contains millions of bacteria is mixed in the water of the bottle. If the water is allowed to sit for a while, especially at a warm temperature, the bacteria tend to grow rapidly. When you drink the same water again, it finds a passage into your body, increasing the risk of numerous health-related issues. The risk of getting sick is higher when you share your bottle of water with someone suffering from a communicable disease.
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