Having access to a safe water supply is important to improve a person's quality of life. We examine the relationship between the influence of water availability on monthly household expenditures (the dependetit variable) and independent variables such as household characteristics, tank size, usage instmetions and post-construction guidatice, including the management of water-related health risks. The sample consisted of 301 respotidetits who hatvest rainwater in Uganda. A multiple regression atialysis was used to analyse the data. The fmditigs show that post-construction guidance and tank size were sigtiificant variables. This study suggests the need for a follow-up to improve health after the installation of water supply equipment, i.e., to provide information about water risks, foster reading norms and facilitate the availability and affordability of information sources, e.g., subsidised newspapers and information support devices (computers). Additionally, this study shows the possibility of increased savings due to reduced expetiditures on water from vendors and the management of water-related health risks caused by a water shortage, e.g., dehydration. Overall, the study reveals two possible ways to advance policy and health in developing countries: (1) etisming sufficient post-construction guidance for all water resources; and (2) ensuring a sustainable supply of adequate safe water in households.