Movie/series about an apocalypse

A group of people in some sort of apocalypse come across some sort of water tower or something that has people living in it that have connections to the government and the president. They have food and water and they also have video tapes from around the world that are looking for their surviving family members. The original group of people that came across them are allowed to stay there as long as they do chores I think. This is all I can remember, Im not sure if it was a film or a series😁 It was in colour & in English/American

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