I stocked on my favorite brand when the shelves were full. Paper towels too.
Last shortage I had to buy cheap one ply and use two or three times more than usual. I decided I wasn't doing that again.
Shelves at my Walmart had some tp but not my brand. So I didn't buy any.
There are shortages of other items too. I think people are just buying up whatever. There is lots of canned meats, chicken, tuna and soups. I stocked up on some of those. I am making sure we have enough to eat no matter what happens.