A new report from the Associated Press this morning might have millions of people rushing out to purchase water filtration gear.   According to a five-month AP investigation of drinking water supplies of 24 major metropolitan areas, it was discovered that the water supplies serving upwards of 40 million Americans contain a “vast array of pharmaceuticals.”   Trace amounts of antibiotics, anti-convulsants, mood stabilizers, sex hormones were identified over the course of the investigation.   To be fair, the trace amounts are well below any medical dose, but scientists are concerned about longer-term consequences of the presence of these drugs in our drinking water.   The AP report quotes Benjamin H. Grumbles, assistant administrator for water at the U.S. Environmental Protection Agency as saying, "We recognize it is a growing concern and we're taking it very seriously."   I sincerely hope someone is taking this seriously.