Water

When it comes to water, what you drink, when you drink and how much you drink is very important for a healthy body. All living cells and organs need water to function. Water is the basis of essential body fluids such as blood and lymph; it lubricates joints; it is needed for the formation of saliva; it provides the protective cushion for the body’s tissues and helps to eliminate digestive waste from the body.

There is no such thing as naturally pure water. In nature, all water contains some impurities. As water flows in streams, sits in lakes, and filters through layers of soil and rock in the ground, it dissolves or absorbs the substances that it touches. Some of these substances are harmless. In fact, some people prefer mineral water precisely because minerals give it an appealing taste. However, at certain levels minerals, just like man-made chemicals, are considered contaminants that can make water unpalatable or even unsafe.

Possible threats to water supply. Want to know more: http://www.hc-sc.gc.ca/ewh-semt/water-eau/drink-potab/index-eng.php http://www.ene.gov.on.ca/en/water/index.php