Susan,

Here's what I carry for my 14-18 hour car trips. This is my Personal Support Kit. It's designed to allow me to survive in a rental car for a while, or make a walk to better shelter, more water, more food, or find my way to some help.

Shelter
5'x9' brown tarp
Fleece car blanket w/small pillow
mylar emergency blanket
55gal garbage bag

Water
1 liter nalgene bottle
Water purification tablets

Food
A fruitcake (Sunmade)
6 Datrex Bars
2 large bags of Beef Jerky
Assorted restaurant condiments
2 coffee bags
8 tea bags

Warmth

BlastMatch
Wet Tender
Magnesium Bar
2 Bic Lighters
2 small boxes of short strike anywhere matches
12 chemical hand warmers
Touque
Insulated Gloves
Pair/dry socks
baggie of dryer lint
6 tea candles
4 Trioxilene tablets
1 can of "Magic Heat" w/stove

Other

Large metal Signal Mirror
50ft of paracord
10-in-1 survival tool (magnifying glass, compass, knife edge, flathead screwdriver, butterfly nut wrench, bottle opener)
Large Lensatic Compass
Photon/Laser combo light
2 pocket knives
Large First Aid Kit
Small First Aid kit
Wind up flashlight w/12vdc female outlet
xxxxx(powers cell phone & Electric Cup)
Survival Kit-in-a-Can
Plastic Spork
Motel size bar of soap
Electric Cup (powered by windup flashlight)
Metal enameled camping cup
FM radio receiver (w/batteries)
Camper's roll of Toilet Paper
2 packs of Bug Wipes
1 Travel Pack of Baby Wipes
small packet of leather lacing & string

I fit everything into a hunting vest and it's attached game vest.

There's a lot more in my kit than what you would need Sue, but hopefully my kit contents will provide you with some intelligent food for thought.
_________________________
QMC, USCG (Ret)
The best luck is what you make yourself!