I add olive oil, to make it about a 1-3 ratio.  I use Carapelli brand
which also has a "mild" and a "light" flavor.  My ferrets love it.  This
is my favorite brand of olive oil and the only one I will buy due to its
excellent flavor.
 
Eleanor, Donald and the 6 pack of ferrets plus 2
[Posted in FML issue 5339]