While I was on my trip I learned that some companies are adding sodium to the bottled water they are marketing. How is that even LEGAL!! What a crime. The added sodium leaves you thirsty for more, and dehydrates you. Thus...increasing the companies profits! Unbelievable. The major brand I know of is Dasani (made by Coca-Cola), but I am sure there are more. So read the labels carefully.
A few brands that I know of that don't add anything; Fuji, Penta, and Evian.
I often bring along a "Sigg" with water in it...avoiding plastic chemicals leeching into the water I'm drinking.