I'd say she is getting plenty of fluid through the food. I feed NB, but not the duck. Mine eats it really well. I'm going to order Ladyjane's brand that she was talking about and start mixing that with my NB. I like to mix them. I know they can drive you over the edge when they're sick. You wish they could talk! It is so hard to figure out ways to get them to eat and drink. I hope she starts doing better soon. She sounds like she is improving some and at least isn't going downhill. That's something.
