Hotels and alternatives
Nothing. Spend your nights in Tataouine.
Restaurants and alternatives
Nothing. Eat your standard meals in Tataouine. However, there are some small food stores in the new village of Guermessa, where you can buy drinks and snacks, bread, cheese etc.
Nothing. Do this in Tataouine.
Limited. If you're getting up early in the morning you might be lucky to catch a bus between Tataouine and Guermessa. Otherwise, you will have to arrange for your own transportation in Tataouine. This involves hiring a taxi for the time you need to get out here. You should try to arrange for a round trip including Douiret and Chenini, which would cost you 30- 40 dinars.
Finding the right way to Guermessa can be a bit confusing. You should follow the bad road marked for Ksar Ghilane for about 3 km. Then you'll see a similar (if not as bad) road to your left. If you follow this, you cannot miss out on Guermessa.