I’ve always been told that most sickness during an emergency situation comes from people not adequately cleaning their hands after… wiping.
If you don’t have access to running water, keeping your hands clean can be an issue, and even a relatively minor illness during an emergency situation can become very troublesome, very quickly.
I recommend that the next time you are at the grocery store, grab a large bottle of hand sanitizer to keep on hand just in case. It’s pretty inexpensive, stores easily, and can be used as an emergency firestarter in a pinch too.