Hotels and alternatives
There are no hotels in Gightis or the nearby village. Your best options are going to Medenine or Houmt Souq on Jerba.
Restaurants and alternatives
Nothing. Same as for Hotels and Alternatives. There are however food stores in the nearby village of Bou Grara.
Same as above.
Get your seat in a shared taxi in Medenine or Houmt Souq for Bou Grara. Expect no more than a few departs per day, so you could easily get stranded here. If you do, walk for 2 hours to Jorf, where you easily get transport to Jerba.