In the 2021 Census of Population conducted by Statistics Canada, Drinkwater had a population of  living in  of its  total private dwellings, a change of  from its 2016 population of .
In the 2021 Census of Population conducted by Statistics Canada, Drinkwater's population was found to be  residing in  of its overall private residences, showing a difference of  compared to its 2016 population figure.