Philadelphia's Water Contamination Crisis: Bottled Water in High Demand.

Philadelphia officials warned residents to drink and cook with bottled water after a chemical spill, but later corrected themselves, saying tap water was safe to drink until Monday night. The spill occurred in a Delaware River tributary, and officials are still unsure if the water supply was contaminated. The spill contained hazardous materials, including butyl acrylate, ethyl acrylate, and methyl methacrylate. The potential for contamination is dropping as time passes and tests continue to come up clean, officials said. It's best practice for households to maintain two days of water on hand for emergency situations such as this.