Forgo saucers of milk for kitty. It can cause diarrhea. Dairy products cause diarrhea in ferrets as well. Feeding a pet home cooked food is fine - if it's nutritionally complete. Check your recipe with a vet.
Clam juice is a good source.
Ferrets have also been found to benefit from taurine as well. Weigh your pet periodically. Stand alone on the scales and get a reading, then pick up the pet and weigh again. Ask if you can use the scales in your vet's office. Use a baby scale.