Can Bottled Water be Trusted Everywhere in the World?

With global population growth increasing at an alarming rate, scarcity of the world's resources has become a growing issue with local, regional, and global implications.  The availability of safe drinking water is the most important issue to humans in the majority of this world.  In most developing and third world countries, freshwater contamination is ever present.  Fresh drinking water has become privatized and bottled water boasts the reputation of the safest drinking water in most countries.  However, this article reports that recent tests have shown unsafe levels of arsenic, which is a carcinogen, have been found in many of Pakistan's bottled water.  If bottled water is not always the safest bet, what is?