So before you choose a ferret, be sure you want to be owned by one. You need to know what you are in for. Don't cramp your pet into a tiny cage to save money. Large water bottles that attach to the outside of the cage are fine but ferrets also enjoy a bowl of fresh water to drink and play in. Use glass or ceramic heavy enough to not tip over easily.
Ferrets have a high metabolism.
From food eaten to waste expelled takes only about three hours. So be sure food is always available. Check this several times a day. Ferrets also enjoy banana, grapes, raisens, cucumber, green pepper, dry unsweetened cereal, and a taste of ice cream sometimes. A good liquid vitamin like Ferretone is highly recommended.