There is currently a debate about whether bottled water is of any benefit at all. There is also a question about the environmental impact of the high number of plastic bottles now in circulation - plastic bottles which use to hold bottled water. Whether you drink bottled or tap water, is really a personal choice. Some people just like the taste of certain brands of bottled water, or perhaps they prefer the sparkling variety to still tap water. Whatever your preference, you should note that in most developed countries, tap water is safe to drink anyway. You should not be going for bottled water for its health benefits - this is because research has shown that the quoted health benefits of bottled water are of dubious heritage.