Lucifer's Hammer,
by Niven and Pournelle,
is a good read, and a wake up call.

One Second After,
also illustrates how a simple EMP strike could devastate the entire US, with massive fatalities and little actual material damage.

There's certainly no lack of Television shows (fictional and "Reality TV"), Movies, and Books for preppers to enjoy. Does anyone really look to these sources for viable preparedness ideas?

Speaking for myself..no. I might watch something like that for entertainment, but for viable ideas, for interesting problem solving , first hand accounts of what people are doing (non fiction) including what fails is of value to me.

Non fiction, historical shows, such as the many shows from Ruth, Peter and Tom are of interest and I watch.

My take is, if the book, movie....is of personal interest, you can watch and take in for other tip, ideas, profiling of people.... take farmgals and others ideas about ponds... a moat was a defensive tool and who knows, May have even helped with drainage.

I believe peppercorn or another mentioned ditches for fire breaks? Well if you can keep water in them, you can maybe grow wild rice, frogs....AND help with grass fire

I have ditches that I am toying with planting wild rice in, same for a pond I dug 25 years ago

Almost all good info can lead to new angles, so if the media floats your boat, let your mind wander

I read the A. American books (Going Home, Surviving Home, etc). The William Forstchen books (One Second After, One Year After and The Final Day) are well-written. If you like that genre, try G Michaeel Hopf.
I enjoy many of the post-apocalyptic shows on now, Walking Dead, The Colony, etc - if only to help imagine all the possible ways that we as humans cope with the collapse of civilization (or don't). Though sometimes it's for the "what not to do" lol! There is a newish Danish series called The Rain on Netfix. It is typical understated Scandinavian thriller/horror.