Mineral water or "zero mineral" water!

Generally we take mineral water for a healthy drink because it is free of germs and in a well preserved packing.
The name given to it, is really very interesting.
We call it mineral water .
Is it full of minerals?
Its all 'salt' has been filtered mechanically and the mineral content is very low.
Minerals are necessary parts of our balanced diet.
We take minerals through water and fruits,vegetables and cereals etc.
The major part of minerals come from water.
In a complex process of filtrationn all the salt content of water goes tremendously down and in fact there no salts or minerals are left in a mineral water bottle.
Then think again.
Are minerals really necessary for us?
From where do we will be able to get them?
Is distilled water or filtered water not dangerous for our isotonic cytoplasm?
Are we wasting money for a bottle of unhealthy water?
Why the 'water' of a particular place suits us and makes us healthy?
Is it not true that the water of natural springs are able to cure many diseases?
Is it not true that the water of a small river coming down from mountains, is full of abstracts of many herbs and shrubs?
Then is it a wise step to filter,filter, filter and filter the natural mineral water?