You only need a solution when there is a problem.
State-mandated rationing indicates there is a supply problem. We want more water, and the existence of a government monopoly interferes with the efforts of the private sector to provide it.
We have very cheap water...
Even when used at the state-approved time, in the state-approved way, it is likely not as cheap as it would be when supplied in the absence of a government monopoly. And if you are caught using it otherwise, the cost can rise sharply, particularly if you try to resist.
... if there is only the problem as raised by RJag then that can be resolved through a government body such as the Ombudsman, end of story.
Even if there was only the problem raised by rjag, I think most people would prefer a system where expressing their dissatisfaction is no more bothersome than taking their business to a competitor over a system where the process begins with initiating lengthy administrative procedures.