There's a quirky article profiling King Crimson ahead of their appearance in Denver.
The above article references a video taken during the band's 2014 tour.
"One of my favorite little clips features the band striding from their hotel in Wisconsin a couple of years ago, onto their not-terribly-plush tour bus and taking a trip to, not kidding, Walmart. Fripp explains with a sly smile he’s only making the trip to pick up some mineral water, a few others on the bus concede sheepishly that they’ll be on the hunt for more caloric indulgences. And the clip ends with a shot of Fripp, the “Yoda of prog guitar” as he’s been incautiously if not terribly inappropriately termed, exiting the escalator, grabbing a cart and disappearing into a Midwestern Walmart in search of bottled water, a cheerful “hello shoppers” recording resonating thinly overhead."
Here's a reminder of the video in question.