Bleach+water solution is effective for one day only. It must be discarded every day or it is not effective.
Have on hand OTC meds, like aspirin, acetaminophen, etc, and antibiotic ointments, band aids and other, similar drugstore items..if this whole thing turns out not to be very bad, all these things will be useful anyway..
If possible, have extra doses of prescription meds on hand, too.
Keep at least one vehicle’s gas tank full, and keep said vehicle in good repair...
Be very quiet around your neighborhood and town about what you have, be it extra food, ammo, etc.,in case things DO get really bad.. it’s called self-preservation!!