A first aid kit is read as preparedness and the instinct to care for someone, including yourself. In dream symbolism it often appears when something feels in need of quick, practical tending.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.