At a minimum, the American Red Cross recommends you should have:
Water: 1-gallon per person, per day (three-day supply for evacuation, two-week supply for home)
Food: nonperishable, easy-to-prepare items (three-day supply for evacuation, two-week supply for home)
Battery-powered or hand-crank radio (NOAA Weather Radio, if possible)
First aid kit
Medications (seven-day supply) and medical items
Sanitation and personal hygiene items
Copies of personal documents (medication list and pertinent medical information, proof of address, deed/lease to home, passports, birth certificates and insurance policies)
Cellphone with chargers
Family and emergency contact information
Consider the needs of all family members and add supplies to your kit. Suggested items to help meet additional needs include medical supplies, baby supplies, pet supplies, activities for children, sleeping bag, extra clothes and a manual can opener.
Maui Electric Co. also recommends:
Customers should unplug all unnecessary electric equipment and appliances if a power outage occurs until the storm has passed or until power is restored.
If one needs to evacuate, remember to shut off electricity at the main breaker or switch.
Do not plug portable generators into household electrical outlets.
Those with rooftop photovoltaic systems should consult with their licensed solar contractor regarding normal and emergency operation procedures.
Hawaii Gas advises its propane tank and cylinder customers not to shut off their gas supply unless notified to evacuate their premises by local authorities. If customers turn off their gas, only a trained Hawaii Gas employee can turn it back on, according to the company.