Staying where there are lots of people is a bad idea overall. If possible, prep for relocating -- like maybe rent a small storage locker. Then just prep for short term, like a go bag at the apartment and one in the car.
Always be about a month ahead of prescription refills so you aren't running out 7 days after the event starts.
You should also get in the habit of keeping your gas tank above half full at all times. When it hits half, go ahead and fill up or start thinking of gettting gas at your next opportunity. I've done that since college. I can't stand getting in the car and seeing the needle below 1/4. It's extremely rare now that I ever see the needle dip below 1/4. I'm usually filling up between 1/4 and 1/2.
You're also going to need power. Get a battery-powered generator with solar recharging. At least be able to keep a cell phone charged.
Also, get an emergency radio. i have one that works on regular batteries plus a built-in lithium battery that uses solar recharge, hand-crank recharge, A/C recharge, and DC (car) recharge.
Last, have some cash stuck away somewhere. When you don't have something you need, you'll need to initially have cash if the data networks and power grids are down. Later on hard currencies like alcohol, ammo, guns, and medicines will be in high demand.
I realize this is a video about apartment prepping, but that shouldn't mean have some food and water and stay put. A large apartment building is too much of a gamble. Like was said, what happens in a fire? If you're way up in the building, there may not be any safety systems working to extinguish it. best idea is to just not be there when things get bad.