I have a friend who is convinced there will be no food, gasoline, heating fuel, or electricity by winter. He and his wife bought a giant freezer and filled it full of meat, and bought a generator to keep the freezer going, and solar panels to keep the generator going... As a mostly-vegetarian I'm not too impressed with this - though I guess if things devolve to the level he's predicting, I know where to find some meat.
I live where there are big snow storms and long power outages, and I'm not close to stores so I was already in the habit of infrequent stock-ups of large-ish quantities. Back when stay-home started it was winter and I was already prepared with a good 2 to 4 week supply of most everything. The only thing I went a little crazy on was cat food - I saw it out of stock most places online, so when I found some I bought a couple huge bags. That was irrational hoarder panic, since half the time my cat turns her nose up at what I offer and catches herself a chipmunk for breakfast.
Now my grocery stores are still out of disinfecting wipes, but I'm a one-person household, working at home, and going virtually nowhere since March, so I have no pressing need to disinfect much. Everything else that disappeared for a time is back now in my usual stores - paper products, baking supplies, rice and beans. But seeing what happened in the spring has made me want to stockpile just a little more of those things than usual for the fall and winter.