This list depends greatly on the weather. In February when I went, as well as most of the winter months, the desert is warm and pleasant during the day but cold and windy at night. Layers work great for this weather.
You don’t want to bring more than a backpack with you, so be strategic.
The organization that I did my trek with provided water as well as decent sleeping arrangements with blankets provided. These were heavy wool blankets. I still needed all my extra clothing and my lightweight silk sleeping bag liner to be warm enough. Some camel treks give you just the blanket that was on the camel’s back that you rode on. Find out as much as you can prior and plan accordingly. Don’t underestimate the cold windy desert at night!!!