Following are a series of websites and related information that may be of use to you as you consider emergency preparation, water storage or travel to areas of water concern.

The CDC has very good recommendations for water preparation in case of disaster:
http://www.bt.cdc.gov/disasters/earthquakes/food.asp

Toxic Industrial Chemicals (TICs) and other contaminates may be present in your local water: Go to this CDC site to see an overview of the hazards for TICs.
http://www.osha.gov/SLTC/emergencypreparedness/guides/chemical.html

Travel: Before you travel internationally, check out the Center for Disease Controls (CDC) list of countries with water or disease issues and warnings:
http://www.cdc.gov/malaria/travel/

For Travel outside the US, Conde Naste Magazine outlines some surprising information about local water quality and purification options when you travel: Click Here to download PDF Article

Whatcom County, Washington has a great site for learning more about disaster preparation and water storage:
http://www.co.whatcom.wa.us/dem/prepare/waterpure.jsp

The World Health Organization (WHO) has a broad database of water related information:
http://www.who.int/en/

The following link provides information about different ways to purify water in various environments as well as a listing of other resources:
http://www.pandemicreferenceguides.com/infopages/waterpreparedness.html

While PRISMEDICAL focuses on drinking water, you may also want to know about other ways to use water during an outage. This website article offers some ideas for toilet water use, dishwashing and water for pets:
http://www.associatedcontent.com/article/133103/surviving_a_water_outage.html