That old "how do I best research this or should I just wing it?" feeling

Things I need to know more about in order to use this Gintama plotbunny properly:

1. Modern Japan
2. Historical Japan

Specifically, "how would people keep warm in a power outage in winter and what else would be affected (and what wouldn't be)".

Ranma 1/2: One Page Per Volume, Part 33

( de-aging the Takahashi way )

Ranma 1/2: One Page Per Volume, Part 34

( the second time Akane beats up people in her sleep )

Ranma 1/2: One Page Per Volume, Part 35

( Konatsu, Cinderella kunoichi )

Ranma 1/2: One Page Per Volume, Part 36

Coming close to the end... I'll post the two last posts, for the two lasts volumes, tomorrow. Now we turn to volume 36 and the resolution of the long-standing Nodoka plot.

Art reads from left to right.
( Plot progression? In MY Ranma 1/2?? )