Looking for an American documentary that was watched on TV on the Discovery Channel when it was updated with an episode a week?

The documentary was titled Doomsday Preppers and it aired on the Discovery Channel from 2011 to 2014. The series followed various types of "doomsday preppers" as they prepared for the end of the world and provided some interesting insights. One of the episodes was about a group of experts in various fields, including medicine, engineering, military, and more, who are trying to survive in an abandoned city. They set up a base in this city to learn how to survive and protect themselves. They modify a large van and install a fire-breathing device to make a quick getaway if needed. During their journey, they encountered many difficulties, including lack of food, water and medical equipment. They also learn how to survive in this environment, including how to filter water and make food. The series provides an interesting look at the skills and knowledge viewers need to survive in extreme situations.