Severe abdominal pain after drinking old water in plastic bottle standing on office desk?

Chang water after 6 : FEMA (the Federal Emergency Management Agency) recommends storing tap water in clean plastic, glass, enameled metal, or fiberglass container, it should be tightly sealed and stored in a dark, cool location. The water should be rotated out about every six months. Stored water may get some algae on the container and there is a slight risk of bacterial growth after several months.