If you want to thrive instead of just survive, consider a large emergency portable generator (6,000-9,000 watts) instead.
Yes, you can string extension cords from the generator. But, you won't be able to tap its full potential.
Instead, large generators work best with manual transfer switches that can restore power in up to 10 circuits in your main electrical panel. In other words, they can energize multiple rooms in your home (minus a central air conditioner).
For long-term outages, you will want a more permanent solution, such as a home standby or whole house generator. However, for shorter outages, Medium, Large, and Extra Large Generators should do the trick, depending on how much you want to power.