What kind of street water supply is is that you are so worried about? Around here, we worry that an earthquake could knock out water supplies for a while. Prudent people keep 5 or 10 gallons of bottled water on hand for emergency drinking supply for several days. That in conjunction with 40 or 50 gallons in the water heater will keep a family alive for a long time.
Certainly control systems exist to perform all the functions you are trying to achieve. It goes beyond plumbing supplies. You need to look for industrial controls.