[Knowledge about consumption of plain water in adults of low socioeconomic status of the city of Cuernavaca, México].

Objective: To describe and compare the everyday knowledge about plain water consumption among "small" and "big drinkers".

Materials And Methods: A qualitative study was conducted between April and August 2010 in Mexico. Eight focus groups with low socioeconomic status adults as key informants were conformed; half of the groups were conducted with men and half with women.