Charles Drinkwater and Elvira Thrasher had three daughters:
Amy Belle Drinkwater, born March 10, 1879, my grandmother.She married Henry Alexander Storer; they were teachers in the New York City schools.
Alma Virona Drinkwater, born September 11, 1880.She married William Holmes, a lawyer in Monticello, NY.
Sara Medella Drinkwater, born May 16, 1885.She married Joseph A. Moline.They lived on the Drinkwater farm in Greenwich until Quabbin Reservoir was created, then had a farm in Phillipston Four Corners, Mass.
Neither Sara nor Alma had children.
I think it is likely that Ellery Drinkwater is buried in Quabbin Cemetery.