If any of those things happen, you'll need clean water. In addition to storing some water, you'll need a renewable supply. Though distillation is the best technique, some other options are discussed here:

http://www.practicalsurvivor.com/emergencywaterfiltration

Aside from reading how to make a filter yourself with mosses, carbon, and stones, this is one that's recommended: Sawyer Products SP191 Point Zero Two Bucket Purifier Assembly Kit with Faucet Adapter

As for shelter and heating/cooling, some interesting ideas here like using a tent indoors: https://dengarden.com/home-improvement/How-to-keep-warm-in-t...

More ideas:

http://www.bushcraftuk.com/forum/archive/index.php/t-37923.h...

http://urbansurvivalsite.com/ways-to-stay-cool-without-power...

Go solar, assuming the related equipment isn't damaged:

http://news.energysage.com/cheapest-solar-panels-price-per-w...

http://fortune.com/2016/06/13/solar-to-get-crazy-cheap/