Hotels and alternatives
Nothing. Spend the night in Tataouine.
Restaurants and alternatives
Nothing. Eat in Tataouine or Chenini if this is part of your itinerary.
Nothing. This you should do in Tataouine, where there are plenty of banks.
No public transportation. Contrary to Chenini, you should not rely on hitching out here, as there are far less cars going out to Douiret.
Many travellers who visit Douiret without being part of an organized trip, rent a taxi for the return trip in Tataouine. Then they also visit nearby destinations like Chenini and Guermessa.