2-3 hours water supply in 12 hours

Dear Admin team
Today Morning water supply started at 6.30 in the morning and by 8.45 it stopped. Then it started at around 1300 hours and stopped bt 1330. Till 1815 in the evening there is no water supply.
I asked security person few times, Once he said no tanker, once he switched on and water started but stopped within half an hour. Many times no one pickup at security intercom.
Morning is very cruitial time for everyone. Just because of water many of the occation many of us are getting delayed to office.
Can we fill the overhead tank in the night so that morning water supply can be started early(Anyway no one would use it in night). Because as the water supply starts late in the morning and every house is waiting for the water, it takes lot of time to reach water in few houses based on water pipe location in the tank(some time I get water only after 20 minutes of starting pump).
Also I feel due to storage of water we must be using more water than normal. Western comode needs more water if we pour it from outside compare to flush.
I understand the problem of water shortage. But we need to do something at the earliest.
Kishore Jadhav