Let's look at one important aspect of water.  It's PH level.  It's pretty important.  A low blood PH (under 7.2) usually represents sickness.  Alcohols, Coca Cola and other sugary junk drinks all have PH levels in the acid range.  Your water should attribute to a healthy PH blood balance.  Remember that your body uses it's water supply to make blood.  Now a low PH does not always mean that the water is unhealthy.  It's just that your body will have to work a little harder to "restore" its healthy balance.  Most municipal tap water supplies come in around 6.4 to 6.7 (as do the "tap in a bottle" brands from Coke and Pepsi).

Now that I'm on the subject of "tap in a bottle" brands, do yourself a favor and stay away from the brands that spend more on advertising than the waters even worth.  Aquafina and Dasani have the same Acidic PH as tap water and is the same water they use to make Coke and Pepsi.  They send it through a filter and then sell it as "refreshing".  I really can't even provide clients with reports because the water comes from 33 different public faucets!

Here are some results of locally available water: