Being always prepared is not only a Boy Scouts' theme. Indeed, this should also apply to motorists. Given standard safety and driver-assist features seen in all new vehicles today, what could be lacking in the entire equation is you — the driver. What might seem common sense could be construed differently with everything at our fingertips when driving. So, it's up to you to ensure you're well prepared for anything that may arise during errand running, and certainly shuffling children.
It's good practice to have a First Aid kit at-the-ready, whether in glove box, center console or any other area that's easily accessible and within quick reach. As well, such a kit will need to be updated in terms of restocking supplies and adding anything that may be missing. Aspirin is a common item to forget. In all, let instinct guide your motivation toward safety.