They will not accept anything other than your official paper ticket and it would be horrifying to have to drive all they way back home to get it.
I started prepping my costumes 6 months before BM. I went all handmade and all original and it was a ridiculous amount of work (but worth it for the epic photos).
Mimosas for breakfast, beer with lunch, and cocktails for dinner (and bring plenty extra to share with your new burner friends).
The only things you can buy at Burning Man are ice and coffee. You'll have to bring all of your food for your entire burn.
You can’t buy water either. So you’ll need to plan for drinking water and showering water (and disposing of your greywater).
It gets HOT starting around 8am. And you’ll likely need a nap in the afternoon. Shade is an absolute priority on the playa.