According to a university study, bottled water is also much more likely to be contaminated or become a source of infection, the Daily Mail reported.
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The warning suggests that much of the ore than 1.5-billion-pound people from Britain pay for bottled water each year in the belief that it is better for us is spent mistakenly.
On an average, we drink 33 litres of bottled water annually, whether ordinary mineral, fizzy, or 'purified' tap water.
Almost a quarter of people who drink bottled water at home say they do so because they believe it is better for them than tap water, according to market researchers Mintel.
But what these consumers may not realise is that tap water must be checked daily under a rigorous inspection regime.
It also contains trace amounts of chlorine that prevent the spread of anything harmful like bacterial infections.
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After a bottle of water is opened it has no way of remaining sterile, and so must be drunk within days.
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