Fill clean jugs/sinks/bathtubs with water for bathing. Moist towelettes and baby wipes can help with personal sanitation. One gallon of water per person per day is a good rule of thumb; more during warmer months.
Know where the water and gas emergency shut-off valves are located in your home.
Make sure outdoor furniture is secure. Patio tables and chairs can easily become airborne in strong winds.
Have a first aid kit nearby.
Often forgotten, be sure to secure important personal papers and documents.
Unplug unused electronic equipment until the storm has passed.
Don't use charcoal and gas grills indoors.
If you're caught outside, find a low place such as a ravine or valley. Be alert for flash floods.