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As a starting point, it's worth appreciating that our body is 50-70% water - so our very survival is intrinsically linked to maintaining the right hydration levels within our body.
So, the general guidance is that we should be drinking at least 2 liters of water everyday.
The body naturally loses water throughout the day by breathing, sweating, bowel movements and urinating; so it's a case of keeping our water levels at the right levels.
If you factor in differing levels of exercise or the climates we live in, then our hydration levels can vary significantly and the recommended intake of 2 liters may not be sufficient. Similarly, if you are sick with the flu or pregnant / breastfeeding then you are likely to need to up the amount of water you are drinking.
But why is this?