buy teh haloz
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There is a large difference between bottles waters. The best advice is to buy spring water with proven qualities (Evian or your local bottled spring water) and to change the water you drink once in a while as their ph and especially mineral content varires a lot. Drinking different types of water helps balance this.
And no, water isn't the same. Tap water isn't as good as good spring water. You may not notice the difference in short term but if you care about your long term health, stick to quality bottled stuff.
If the PH balance of bottled water varies so much maybe it would be best to stick to tap