Not sure about other countries in Asia, but here in Thailand every toilet has a sprayer next to it. You get a lot cleaner and use a lot less toilet paper. So no TP panic here. If I ever move back to the US I will definitely install one.
At least that's the way here in Germany. While flour, toilet paper, some sorts of canned food and random other stuff is sold out in most super markets, the small turkish shop down the street has everything in stock.