Start out with hot beverages and soup.
You will save on fuel by doing your cooking all at once and still being able to have something hot thorough out the day.
You can also cook in them but if nothing else being able to have a hot cup of coffee can make a cold day more bearable.
It also allows you to share wit people who may not be as prepared as you.
Large sports thermos allow you to give people the gift of hot water if you have it to spare.
We have a reservoir on the wood stove which means hot water for washing is always available.
In Austin, TX, people are standing outside of grocery stores for 3 hours waiting to get inside to buy whatever is on the shelves... if anything. The one grocery store here closed it's doors a couple days ago. This is proof there is only 3 days of food on grocery shelves. One would have thought through this past year of covid people would keep a full pantry.