No one will be allowed back into evacuated neighborhoods until roads are cleared and emergency workers are sure downed power lines are no longer dangerous. First, bring your evacuation kit with important papers, phone numbers and other necessities. Keep this with you or a member of your family at all times. Then pack something to sleep on and pillows and sheets. Cots usually are not provided, so you'll be sleeping on the floor.
Inflatable mattresses are compact and easy to pack.
Another choice is a folding patio lounge chair. You'll be placed in hallways or other places away from windows. And it could get crowded since emergency officials figure on just 10 square feet per person when calculating shelter capacity. Each shelter will have a shelter manager, often the principal if it's at a school, and fire rescue and law enforcement personnel. Food will be provided.