Not sure what you are doing by this river, I don't even know what city, state or country that river is in... You left no details... You should look into RIDESHARE on the BM website. http://rideshare.burningman.com
.... You are going to need to read the First Timer's Guide, like dragonpilot said.... And like UD says if you are only planning on getting by in the desert with simply a backpack and no food/shelter then you are kinda doing it wrong. When you arrive you should acquire all your supplies.... A gallon of water for each day, a tent, a way to safely secure your tent (the stakes it comes with are not going to hold in a wind storm) and food! The food court is a figment of all of our imaginations... Best of luck with your prep and enjoy TTITD.