It's just not natural even though our body consists of 70%-75% water.
To calculate how much water you should drink daily, multiply your weight in kilogram by 5%.
For example, if you weight 50kg, you need at least 2.5litres of water daily.
I try to drink at least 3 litres a day. And this certainly helps...
This is a 2-litre bottle. It's really easy to drink from. I can just sip and sip and before I know it, 2litres of water has gone down by system. Retails at RM27. 
