17 Most Important Things You Should Always Have in Your Car
1. First aid kit (and manual)
2. High energy snacks and/or MREs
3. Maps
4. Spare tire
Should be in good condition. Along with a tire jack and tire iron.
5. Tire Inflator and Sealer
They are very useful as they can plug a leak (and help you avoid using the above tools) just enough to get you to the auto shop.
6. Jumper Cables
They help dead batteries to start.
7. Your car's manual
They should always be in the glove compartment.
8. Tire pressure gauge
9. Duct tape and WD-40
10. Flashlight
11. Multi-tool
12. Emergency Cellular phone
13. Matches or other fire starter
14. Water bottles
15. Emergency money
16. Blankets
17. Road salt (in winter)