A ferret likes a small variety in its diet and sampling of different foods and meats is good to do. Fish that is non-oily, vegetables, fruit and cereal. Vitamins or mineral supplements are not necessary for your ferret if they are getting a well round diet. One thing to remember about ferret is they have a fast metabolism which means they can eat several times in a day. A fat ferret is usually a big problem for owners to worry about.
Water needs to be kept fresh and readily available.
A rabbit water works well for a ferret. General care of your ferret is a weekly check. Checking the ferret's teeth for soft food partials and sore along the gums. The ferret will get use to you checking its teeth and will make it easily to administer a pill if needed. If you feel it is necessary to clean its teeth, use canine toothpaste.