We had the same problem when our pumping station flooded during Hurricane Floyd. I went up to the mall and waited in line to get water for my family from the National Guard. We would use one gallon of water and flush anyway. They kept saying not to do it but it was three whole days like that. I was just getting ready to drive to the next city and rent a hotel room so I could do laundry and take turns getting a shower, when the water came back on. Did you ever wonder who pumps out a pumping station and blows it dry before they can restore power? LOL.
Fill your tub with water and after you take your bath use the dirty water for flushing the toilet. Fill buckets and save it. Are you boiling your drinking water?. Just store whatever water you can in case they turn it completely off. Buckets, tubs, sinks, anything.