What about one tanker full of potable water and another with about 10,000 one gallon plastic bottles to hand out to the people, who could then fill them from fawcets attached to the tanker??
I recall that after the Haiti earthquake, the Navy stationed an aircraft carrier offshore. In addition to health and food service, the carrier supplied thousands of gallons of fresh water from its desalinization plant onboard (I think they did the same thing after the tsunami in Indonesia).
Of course, that was before Obama decided we didn't need a Navy any more...
I’ll bet that there are a hundred tanker trucks in my area,and theres a factory near here that manufactures plastic bottles.