Assuming you would like tips on how to heat coffee without electricity:
There are a few ways to do this!
1. Use a stovetop espresso maker - these typically don't require electricity, only stovetop power.
2. Heat water on the stove and then pour it over your coffee grounds in a French press - again, no electricity required.
3. If you have an insulated mug or thermos, you can actually boil water and pour it into that container which will then keep your coffee hot for hours - all without using any electricity!