Rainwater as a source of drinking water: A resource recovery case study from Vietnam

•A RFD system was implemented in Ho Chi Minh City.•The technical, social, and economic benefits were evaluated.•A well-designed RFD system and monitoring can ensure high-quality drinking water.•Universities are the best platform for promotion and education of a RFD system.•Beneficiary contributions resolve the lack of sense of ownership of a RFD system.