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.