Make sure your cat has a constant supply of fresh water. He needs to drink water to prevent dehydration. If you have more than one cat, keep them in separate areas of the home until the sick cat is well again. If your cat's eyes are runny, wipe the discharge away as often as needed with warm water and a clean, soft cloth. Adding moisture to the air can help relieve congestion, making it easier for your cat to breathe. The condition has to improve within 7 to 10 days.

Dr. Pitcairn's New Complete Guide to Natural Health for Dogs and Cats