Environmental intervention
Schools in the environmental intervention had collected data on water usage through the CWS and changes in the promotion of water within the school from baseline to follow-up.As previously described, data loggers were installed on CWS to monitor the flow of water through the station. Water flow data collected through the loggers in the initial study demonstrated an increase in CWS use over time and flow changes due to seasonality (greater flow in warmer months) and dependent on days of the week and weekends. For example, spikes in usage were noted on Tuesdays (consistent with sports days being commonly held on Tuesdays) and troughs on weekends when no students were on the school premises. However, within this current study, several issues with data collection through the loggers arose which impacted data quality. At several schools, the data loggers went offline at times for days (5–31 d). A combination of issues contributed to this – the distances required to travel to schools to address logger issues meant they were not resolved as quickly as they might have been and issues with internet reception meant data could not be collected. COVID-19 also affected CWS usage, as clearly shown in Fig. 
Water usage from chilled water stationsNevertheless, despite the issues with data loggers, water stations were still well received, with positive feedback from teachers and students alike. School staff commented that the CWS were well utilised, particularly given the warmer climates in some regions. Comments included:



While there were some changes in the promotion of water in the schools, for example, promoting water on excursion notes and through sports, none were statistically significant within any of the schools (as shown in online Supplementary Table 