My stove, small cook kit, a few eating utensils, a small coffee press, cups and plates. Those stay in my Cruiser all the time along with a couple days food, water and basic sleeping gear. I don't have these for emergency as much as when I just want to get away quick and not have to shop. I'm leaving out the obvious first aid and recovery gear.
These are the things I cant do without. Everything else I bring is a bonus.
Scott