The horror! I always keep a jar of instant for an emergency. Or I have tea.
Get glass pint mason jar. Put 2 T coffee in it. Pour in boiling water. Then pour the jar and coffee into another mug/jar through a fine strainer.
Voila!
Or you can use an old piece of muslin slip cut into a square for that purpose which I have in my kitchen...
You don’t have a funnel thing and paper filters?