What a great question!
Just some thoughts.  Of course no one can do everything, but usually
there is something that each of us can do.  I hope others post ideas to
the fml.  I don't have many resources, but I like finding areas in which
I can help.
 
Go through your pet's items, if there are gently used toys and bedding
you can send to a shelter taking in ferrets.  Perhaps when you order your
own supplies you can order an extra bag of food or bottle of Ferretone to
be sent to a shelter.
 
Get some inexpenseive fleece and cut to make some blakets or sew to
create sleep sacks to send to a shelter.
 
Cut out something simple in your regular routine and send even a $5
donation to one of the groups helping.  It will add up!!
 
Donate some time at a local shelter.  During crisis situations, often
other groups donations and helpers dwindle.
 
Ask others for help.  See if a local pet store will donate items for one
of the intaking shelters.
 
Have a fun fundraiser dinner.  Invite friends for dinner, ask them to
pitch in for a group donation to a shelter.
 
Perhaps you can sell an item on e-bay or donate items for a yardsale that
is raising money for rescues.
 
Join a group that is organizing to be prepared for future emergencies.
(Sukie posted the other day about starting such an emergency group)
[Posted in FML issue 4991]