How Many Glasses Of Water Should You Drink In A Day?

We have been hearing about at least 8 glasses of water 
that you should take in a day 
so that you won't be dehydrated
​and it's the minimum amount. 
The problem is, 
we don't know how big or small that said glass is 
or the volume it contains.
Is it 250 ML or 300 ML per glass? 
It's never stated. 

Glass of water of about 250 ML

Water is life and without it is death 
though one may live or survive for few days. 
We can't just eat food without some liquid 
for there's no way to digest it. 
But how much do we have to drink in a day? 

The answer for me is "it depends" on the person. 
If you're staying home watching TV 
and just lounging in the sofa without much to do, 
then probably you won't be drinking a lot of water. 
If your routine doesn't require much physical activity 
or should I say sedentary, 
then thirst is not that often felt by your body. 

But if you do a lot of hard work, 
 or if you work out in a gym and you sweat a lot, 
then you'll be drinking more than 8 glasses a day for sure. 
Also during hot summer days, 
when you feel uncomfortable, 
water is always the best to consume
every now and then. 

Also, 
you might not remember this. 
When you're out in the water swimming, 
in less than an hour you get thirsty and hungry.
Water easily takes away body heat 
and to remedy that, 
your body makes you feel thirsty
and hungry at the same time.
And when you sleep with your mouth open 
or when you snore, breathing with your mouth, 
 you wake up with a dry throat. 
That's because when you exhale with your mouth, 
moisture in your throat are blown out. 
You can't help but drink something right away. 
​
Every time you feel thirsty, 
your body is telling you to drink water.​
Your need for water really depends on
​how active your lifestyle is. 
The more activities you have, 
the more times you become thirsty 
and the more water you drink. That's it. 

Lastly,
I have to recommend this before I forget.
Never drink cold water because it's bad for the body. 
Remember that we are warm-blooded beings 
and that cold water may disrupt the processes 
going on in our bodies. 
Drink warm or hot water that you can tolerate.