Students at three San Ysidro schools with outdated plumbing fixtures are drinking bottled water after contaminants were found in the water that flows from aged faucets and fountains at one of the campuses. The problem at La Mirada Elementary School prompted the district to investigate the water quality at its two other old campuses, Smythe Elementary School and San Ysidro Middle School. District officials said the bottled water is being dispensed until water-quality testing is done and any necessary fixes made.