How to save battery on my iPhone on a long car ride?

Alright, so I'm going from Cleveland to Pittsburgh, and stopping for lunch in between, so figure about four and a half hours, then, I might be going to the Rock and Roll Hall of Fame, and then that night, I'm going to concert and waiting outside for two hours to get a good spot in the pit. The problem? I lost my car charger. My phone battery has been dying rather quickly and low power mode drains the battery quicker. Listening to music drains my battery pretty fast, too. I've turned location services off, I've turned anything that will drain my battery quickly off. Why does it keep running out? How do I save the battery for a long car ride?

Added (1). I can't afford one at the moment.

Added (2). Lmao, I won't die without it. I just want to make memories since this is my first concert, ever.

Buy a new car charger.

OMG, you may die without your phone.

Some battery saving strategies you can try:
1. During the trip listen to car's radio, not your phone.
2. Don't play any games on your phone.
3. Turn OFF your phone for 45 minutes of each hour. Turn it ON for 15 minutes to check msgs.
4. Review the apps that update themselves and delay the updates. For example: If your mail client updates every 10 minutes, change it to every 30 or 45 mins.
5. Delete apps you don't use or don't use very often.
6. If you haven't 'Rebooted' your phone recently, try that. Lots of things get reset at that time.

Either buy a charger that works off the car cigarette lighter socket, or simply turn off the iPhone. Learn to live without it like you did before you ever go it…

Keep your phone on airplane mode, there's nothing you can do about music draining quickly as far as i know, so the best thing to do is put your phone on airplane mode which shuts down all wireless connections and helps save ALOT of battery, and turn down your screen brightness to the lowest option.