A few months ago I saw this great idea I wanted to pass on to you in case you didn't already know. It is so simple and obvious that once you hear it you will say, "Why didn't I think of that?"
During a power outage, bring in a solar garden light for each room you will be using. They are bright enough to illume the room so you can see to walk and therefore eliminate the need for flashlights and batteries. Return the lights to the garden to re-charge for the next outage.
( I have heard solar lights need their batteries changed about once a year so it would be a good idea to keep a few extra batteries on hand for extended use of the lights.)