What gear would y'all recommend for a trail runner? My goal is to be self sufficient for 1-2 days on my trail running escapades in the desert.

I'm told a bivy sack is the way to go regarding a tent enclosure... I live in Arizona so the weather complications are hot weather, for the most part. I'm trying to put a gear list together on what I'll need... I'm starting ground level with this.

Cheers