I have been through several hurricanes....living down in Biloxi/Gulfport/Charleston, SC/ Guantanamo Bay Cuba....from 1978-93'. Water is probably the most important, food second. Batteries, propane for cooking, if necessary, keep important docs and cash in a portable lock box. Keep gas tanks and prescriptions filled, as well as the bath tubs.
Make sure any pets have food and water, and hopefully a place to seek shelter in that doesn't flood. Most human shelters won't accept pets.
Maps. In case evacuation is ordered. Now days, cell phone chargers. A note left on your kitchen table or fridge, name and a phone number of how to contact you if needed. I bet this info could also be written on a fridge door with a lipstick or mirror if necessary.
Feminine supplies. Medical supplies. The lists can be endless! When we lived down South.....I just kept things ready/handy in case of evacuation, as we saw plenty of hurricanes in those years.
Just my 20 cents...in my own experience
Joaquin; looks like landfall here...not likely. We are merely having a spitting mist so far. 1/10" rain in the rain guage.