Yes, most definitely, you need water more so than food. You can survive somewhat longer without food than you can without water.
In the outback out in the open unless you drink a litre of water per hour during the day you will join the landscape.
Yes water is more important than food for ones body for one to live. A person can live longer without food than without water. But I would say you need both, but most definetely water is very important for you to drink daily and lots of it.
That is like asking is air good for you. But don't drink tap water, or out of warm plastic bottles. I use glass only.
Yes except when you are up to your neck in the hot variety
Drinking up to @least 500Ml ( not all @once ) a day helps to keep you from passing stinking water & hence a stink off you & possibly your clothes too
no, too much make you dead
obviously thats a stupid question
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