When it comes to prepping, look to the Mormons. It’s right there, in the official name of the religion: To be a “Latter-day Saint”’ is explicitly to believe in, and prepare for, the end times. This is why, on a calm morning last September, I arrive just outside Salt Lake City in a place called American Fork and knock on the door of Tyler Stapleton, the chief product engineer for off-grid power products at 4Patriots, one of the biggest companies pushing preparedness into the mainstream. Church members play outsize roles in this multibillion-dollar industry—a global concern where politics and technology collide, with sales fueled by social media and conspiracy