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Water is essential for our lives, obviously, if we get dehydrated, we die. Some of the reasons to drink water are that it helps our kidneys or that it helps control calories. If we drink too much water we can die because of a 'water intoxication', so we have to drink water moderately. We have to know that water is also in food.

There are different answers for these questions, and now I'm going to explain some of them:

A) We should drink between 2 and 3L of water per day or 8 glasses of water.

B) We should drink water because of our thirst, it is the best indicator.

C) We should divide our body weight in half, and then, divide by 8, and that would be the number of cups of water you should drink each day.

And now, I'm going to say things of each that maybe will change you of opinion:

We don't know who created answer A, so we don't know if it is true or if it is a fake or only an ad for making you to buy bottled water.

The option B is quite good, but when you become older that 'indicator' starts losing reliability, and thereupon they sometimes should drink water without being thirst.

Answer C, seems to be an approximated quantity, and maybe it is not reliable fact.

Personally, I think that the most reliable answer is B, because drinking too much water if you aren't thirsty is too uncomfortable. So my personal order would be: B, C and then A.

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Woman Finds Fountain of Youth By Drinking

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How Much Water Do We Really Need to Drink?

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Does the saying that you need eight glasses of water a day actually hold water? Trace looks at how much H2O you really need to drink to keep your body in prime shape. Read More: Born Wet, Human Babies Are 75 Percent Water. Then Comes The Drying http://www.npr.org/blogs/krulwich/2013/11/26/247212488/born-wet-human-babies-are-75-percent-water-then-comes-drying?ft=1&f=1007 "Lovely, no?

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How Much Water Should You Really Drink a Day?

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http://draxe.com/ How much water should you be drinking a day? You should be drinking about 25%-50% of your body weight in ounces daily. It's actually not about how much water you are getting but whether you're staying hydrated or not. Water is vital for your health.

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http://www.fitnessrevolucionario.com/2013/12/22/cuanta-agua-debes-beber-la-respuesta-no-es-2-litros-al-dia/