Which is the best way to develop a "water-demand" visualization app where a company can have real time data updates from a master meter into the systems in offices.
I think there are two options. The first one that may address your immediate question is to interface your GIS with an online system to measure the demand and display this demand in a thematic map inside the GIS environment. The second option is an offline solution that depends on the modeling of the demand data that were collected from previous epochs. And you can use with this modeling time series analysis, Kalman Filter, or Neural Network to forecast the future demand. By this forecasting that will based on your own interval of time, you develop your GIS map to visualize the demand.