SK that is a good idea for the car kits, you could even just put some extra things in their vehicles like bottles of water, small first aid kits, jumper cables, blankets or anything else that you think they may need. just put it in the trunk or behind the seat but try to make sure it is not taking up too much room so it is not taken out by them. I did this with one of my former girlfriends and it really helped her once when her car broke down. I also left her with several hundred dollars of camping and survival gear when we broke up on top of all the hiking and survival gear I bought for her while we were together, so she is pretty well set except for someone to show her how to use everything.
Another thing, just always carry a little extra yourself so you have enough to share. I was out hitch hiking from Virginia to Missouri and got stuck in Indiana and turned around, then got stuck in a big snow storm in West Virginia and spent four days in a Red Cross shelter, the Red Cross people there had no supplies and most of the people coming in were people who had been stuck in the snow in their cars along I-64 and they had no supplies. For the first two days I was sharing what food I had in my pack and scrounging around the building we were in looking for things to help everyone else out with, like candles and blankets (no power in the building). On the third day a little food was brought in from one of the grocery stores and someone brought in a kerosene heater. Day four we were moved to a school gym with a generator, cots and plenty of food and another group took over taking care of everyone. Even though I was one of the people being served it turned out that I was better prepared than those serving us and they listed me as a Red Cross volunteer on the roster they were keeping and I got offers for Red Cross training classes in the mail when I got back home.