In 2008, the author has conducted a research study on behalf of the Caribbean Water Association on the consequences of the constitutional change of the Netherlands Antilles for the drinking water supply on Bonaire, St Eustatius and Saba (BES). This research study formed the basis for further research in the form of this MSc. thesis. Being the responsible Ministry for the supply of drinking water on the future BES islands, VROM positively embraced the idea to study solution alternatives to improve the current situation on the BES islands. The Ministry of VROM granted the author with the financial means and support to conduct this thesis research study. In chapter 7 of this report a set of guidelines and instruments is presented that can support the Ministry of VROM in defining and preparing an improved drinking water supply on the BES islands.