If a water ban is going to happen, the effects of it on your business can be avoided.
A water ban will not last for very long, maybe a couple of months in the worst affected areas.
You could do some or all of these suggestions to help you out.
Before the water ban comes into effect save as much water in ibc tanks in you back gargen if possible.
You could travel to other areas where no ban is in force and fill up ( I would suggest you use a meter water supply and pay for the water you are using, this will take the argument away from the water companies who will moan).
You could also use an indoor water pole system, which use a fraction of the water of a convential wfp system.
or you could go back to using ladders, but be very cafeful with this route because accidents do happen.