During multiple days without power I always carry a small flashlight on my person but oil lanterns and candles (in lantern like enclosures) are hard to beat for general lighting. A few tea-light candles strategically placed will provide light all evening (4-5 hours). You can buy 100 of them for about $5 and each box of 100 is roughly 12"x12"x2".
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"There is not a man of us who does not at times need a helping hand to be stretched out to him, and then shame upon him who will not stretch out the helping hand to his brother." -Theodore Roosevelt