Late to the party, but my family was in between houses and was staying with some dear, dear, friends during Y2K. We discovered that they had a secret bunker with several generators powering refrigerators full of various vaccines (I remember a lot of anthrax vaccines), medications, sterile medical equipment, water purification methods, etc. The bunker also had a “classroom” where they would be teaching their children during the apocalypse, because, no more school I guess (?!). There were also weapons, 10,000 cans of food and military style rations, and gas masks.

They made such a big deal of it that I think they had us leave early because of acute embarrassment... Day after Y2K they got us a hotel room and showed us the door.