You need to put together a bag for your car. Have in it one or two changes of clothes, nutrition bars, bottles of water or a small filter that you can get at Dick's in the hiking section. A Brita won't clean rain water or stream water. You need to have enough stuff to get you to your folks place. Lighters, map(s). smashed roll of tp,hand sanitizer,soap,wash rag,towel. If you wear heels at work, keep sneakers or hiking boots in the car. You should also keep some clothes and things at your folk's place.
I have in mine:
mess kit
small camping stove with fuel
lighter
fire strike
plastic bags ( zip locks gallon bags and a couple of store bags for storing dirty stuff)
ramien noodles
Luna bars
instant coffee and some tea bags
instant oatmeal and dehydrated fruit
extra socks, undies
tank top
t shirt ( when it gets cooler I'll add a long sleeve shirt)
capris ( right now, when it gets cooler,I'll switch them out for pants)
bandannas ( good for sweat, or bandages or even washing with)
tp ( cardboard core taken out and smashed and in ziplock bag)
soap ( small one left over from a motel)
dish soap ( I have some in a small plastic bottle thats for shampoo and stuff when you travel)
small hand sanitizer ( I like the travel sizes for this kind of stuff)
wash cloth and towel ( not a big one, one thats called a "sports" towel)
extra meds
small first aid kit
compass
multi tool
rain poncho and hat
thats all right now. I still need some small stuff yet. Like some maps of the area,a hiking water filter to refill the bottles of water. I'm usually in sneakers but when it gets cooler I may need to find room for my hiking boots in the bottom of the bag. Lots of this stuff is compact and the food and drinks are dried so they take up less space. I vacuum seal the extra socks and panties so they stay clean and dry. I should add an extra poncho because it can be used to make a shelter. That and some paracord. I also need to get a space blanket to stick in there. You look like a leftover burrito but they do keep you warm lol I'm also working on my C&C

Thats just to give you an idea. It's to get you where you need to be. It should be good for at least 3 days. Longer would be better, but that would mean a much larger pack.