I am a new ferret owner. I got two albino ferrets from a lady and I have no history on them. One is losing its hair all on its back and they are both terribly skinny. My vet said they are malnourished. Right now im giving them walmart food and supplementing it with duck soup until I can buy a more quality food. I live in a one horse town and the nearest pet store is two hours away. Any tips on how I can aid them in gaining weight?