Can I tell how much water my body needs by how much I sweat?

No. Sweat is not an accurate Indicator of dehydration. The amount a person sweats can depend on a variety of factors such as environment, clothing, and temperature and activity level. You can't judge your hydration level by the amount of sweat on your skin or t-shirt or by how thirsty you feel. To be safe, make sure you follow the guidelines contained in "How much water should I drink every day?"

The tap water in my area is proclaimed to be "safe to drink". So what are the advantages of bottled water?

Tap water quality is inconsistent at best, and suffers from several disadvantages

First, municipal tap water is usually treated with chlorine, which makes the water taste bitter.

 Second, tap water flows through pipes, which in older buildings may contain lead. Its quality is not guaranteed by the time it reaches you. Further more the supplies are often threatened by industrialization, agriculture, and natural disasters.

Bottled water, on the other hand, offers a more consistent, superior taste compared to tap water. It contains no lead or other harmful chemicals, and no chlorine is used during the purification process.

The sealed bottle also protects the water, so what you get in the bottle is the same water as the source. And lets not forget the convenience of having both hot and cold water offered by our service.  

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