Shame it was cack. There's more survival stuff shown in Day of the Dead than in DAT.
But that's only part of the problem. A movie will flop if it isn't filled with ridiculous special effects, explosions, car chases and so on. Sensible stuff like how to prepare, what kit to buy, what to read up on (etc) would never get written into the script.
Sure. My bunker is in northern Scotland. Or is it in Redruth in Cornwall. Or maybe it's in Limerick, Ireland. Or, or, or . . . .