I dun know about the story on magnetized water...its not a
proven science.
What I know proven is that we human being need natural
water....water that contain no chlorine, florine or any other funny
chemicals....water that contain bactaria or cyst, water that
contain all kinds of heavy metals like lead, asbestos etc.
The best natural water we get are those flowing from the streams at
the top of the mountain. cool & refreshing and free of all
contaminants....at least, forumers here won't scale the mountain to
just to pee there. 
I also won't subscribe to ideas of Diamond water...all hype
only.
Drinking from tap water is a bad idea too ! Have you seen burst
water pipes on the road ? This contaminated water flows to your
tape. Have u seen dead rats, inserts and all kinds of funny things
in the HDB water tank ? I have seen photos of those from a
ex-inspector that checks our water tank and have to fish out all
kinds of things.
So if u drink direct from tap. good luck..
having said so much, SG water is still better than many parts of
the word....I never travel out of singapore without my portable
water purification unit. wait till u come to India...water is
horrible....even bottled water is at least 50 times more
contaminants than the European standard...but the govt there argue
the bottle water have met their standards (India standards) and
they dun follow European standards.....so sad for the indians
there.