During a power failure, a votive candle contained in glass can provide bright, continuous light for many hours and even days. A flashlight may only work for a few hours. The flame on a votive candle is also safe from drafts and sudden blasts of wind. Votive candle are widely available in grocery stores.
Keep a tiny pencil sharpener in your nail pouch to keep a nice sharp point.
For certain types of rooms and some aesthetic tastes, exposed concrete flooring is a nice option. You can get concrete with a pigment color integrated into the material, you can paint the concrete, or you can simply use a clear (non-toxic) sealer for a more modern or industrial look
Tape a sanding sheet around the head of a sponge mop. This will give you the reach you'll need to smooth out hard to reach walls and ceilings before you paint or during construction.