You are in a desert. You can summon one object. However, you can only summon the object itself - if you summon a car, it will arrive without any gas. If you summon a plane, it won't have any fuel either. A gun won't have bullets, a knife... will be whole, and so on. And you can only summon one object. What do you summon?
Your question is flawed. Your definition of “object” is unclear. On one hand, an object could mean a singular atom, since all “objects” could be broken down to this. On the other hand, I could state something incredibly specific, rendering the original purpose of this question completely useless.
1. Mega Altaria 2. Depends on where I am. In my home country, I'd say winter because of how hot it usually is. 3. Cinnamon (NOT pure cinnamon) Low-fi music, but recently I've mostly listened to electronic music.