Question: The Albany Metro Mallers football team plays its home games at a stadium that was once a reservoir for what?

Context paragraphs:
California Golden Bears football: The California Golden Bears football team is the college football team of the University of California, Berkeley.  The team plays its home games at California Memorial Stadium.  Memorial Stadium was built to honor Berkeley alumni, students, and other Californians who died in World War I and modeled after the Colosseum in Rome.  Memorial Stadium was named one of the 40 best college football stadiums by the "Sporting News".  The team also has produced two of the oddest and most memorable plays in college football: Roy "Wrong Way" Riegels' fumble recovery and run toward the California goal line in the 1929 Rose Bowl, and The Play in the 1982 Big Game with the last play five lateral winning kickoff return.

Albany Metro Mallers: The Albany Metro Mallers are a semi-professional football team that has played its home games primarily in Albany, New York, with the 6500-seat Bleecker Stadium as its home field.  The team has long been successful regionally and nationally, having regularly been in the national semipro playoffs, and having won the national semipro title in 2008.  Some of the team's players have gone on to play professional football, and a number of the team’s past and present players are listed among the all-time semipro football record holders.

Bleecker Stadium: Bleecker Stadium is a multi-purpose stadium in Albany, New York.  The stadium was once a reservoir for the Albany public water system.  Today it has a baseball diamond, football/soccer field, and a softball field used by area high schools, colleges, and youth and adult leagues.  Bleecker Stadium hosts several post-season games and series, including the Capital District Pop Warner Super Bowls.  The stadium is on Clinton Avenue which is to the south, Ontario Street is to the east, and Second Street is to the north.  Swinburne Park borders Bleecker to the west.

Albany Firebirds (af2): The Albany Firebirds were a professional arena football team of the af2 based in Albany, New York.  Albany was granted an expansion team in 2002 and began play as the Albany Conquest.  The Firebirds play their home games at the Times Union Center.  They are the second arena football team for Albany, as the city was granted an expansion team, the Albany Firebirds, in the Arena Football League in 1990.  The team moved to Indianapolis, Indiana in 2000 and played as the Indiana Firebirds through 2004 before disbanding.

Randolph–Macon Yellow Jackets football: The Randolph–Macon Yellow Jackets football team represents Randolph–Macon College in the sport of American football.  In 1969 Randolph–Macon defeated the University of Bridgeport (Connecticut) 47–28 in the inaugural Knute Rockne Bowl laying claim to a shared College Division II National Championship with Wittenberg University (Springfield, Ohio) which had defeated William Jewell College in the first Amos Alonzo Stagg Bowl.  The 4 teams had been chosen by the NCAA to compete in the first ever playoffs established for Division II schools.  No complete playoff was set up until 1973.  The 1969 football team was inducted into the college's Hall of Fame in 2004.  The Yellow Jacket football team is currently coached by Pedro Arruza and won the ODAC championship in 2008.  As of Nov 2013 the football team had posted a record 7 seasons with a winning record under Coach Arruza.  The football team plays its home games at Day Field.

Stephen F. Austin Lumberjacks football: The Stephen F. Austin Lumberjacks football program is the intercollegiate American football team for Stephen F. Austin State University located in the U.S. state of Texas.  The team competes in the NCAA Division I Football Championship Subdivision (FCS) and are members of the Southland Conference.  Stephen F. Austin's first football team was fielded in 1923.  The team plays its home games at the 14,575 seat Homer Bryce Stadium in Nacogdoches, Texas.  SFA's football team earned a berth into the FCS playoffs in 2009, which was the first for the university since 1995.  The team also earned a playoff berth in 2010, marking the first time in the program's history that the team had reached the playoffs in consecutive seasons.  The 2010 season also marked the first time that the school had won an outright conference championship since 1989.  Stephen F. Austin's only bowl appearance was the 1973 Poultry Bowl, in which the team defeated Gardner-Webb 31-10 in Gainesville, Georgia.

Puerto Rico FC: Puerto Rico FC is a professional football team based in Bayamón, Puerto Rico.  Founded in 2015, the team plays in the North American Soccer League (NASL), the second tier of the American soccer pyramid.  The team plays its home games at the Juan Ramón Loubriel Stadium.  The team debuted in the 2016 fall season.

North Greenville Crusaders football: The North Greenville Crusaders football program is the intercollegiate American football team for North Greenville University located in the U.S. state of South Carolina.  The team competes in the NCAA Division II as a Division II Independent football team.  North Greenville's first football team was fielded in 1994.  The team plays its home games at the 5,000 seat Younts Stadium in Tigerville, South Carolina.  The Crusaders are coached by Jeff Farrington.

Buffalo Bills: The Buffalo Bills are a professional American football team based in the Buffalo–Niagara Falls metropolitan area.  The Bills compete in the National Football League (NFL), as a member club of the league's American Football Conference (AFC) East division.  The team plays their home games at New Era Field in Orchard Park, New York.  The Bills are the only NFL team that plays its home games in the state of New York (the New York Giants and New York Jets play at MetLife Stadium, located in East Rutherford, New Jersey).  The Bills conduct summer training camp at St. John Fisher College in Pittsford, New York, an eastern suburb of Rochester, New York.

Eastern Illinois Panthers football: The Eastern Illinois Panthers football program is the intercollegiate American football team for the Eastern Illinois University located in the U.S. state of Illinois.  The team competes in the NCAA Division I Football Championship Subdivision (FCS) and are members of the Ohio Valley Conference.  The school's first football team was fielded in 1899.  The team plays its home games at the 10,000 seat O'Brien Stadium.  The record attendance for O'Brien field was 12,600 on November 9, 1980 vs. Northern Iowa.  The all-time record at O'Brien Stadium is 173-85-3 as of the end of the 2016 football season.

Supporting paragraphs: Albany Metro Mallers Bleecker Stadium
Answer: Albany public water system