After living with a cat for six years I have a sure fire list of things that every cat owner must have.

The range from the practical, extravagant and just plain wacky. You decide where they fit in.

Nylon string.
Tie a object to the end and go cat fishing.

Straws.
What cat doesn't like a straw.

Milk rings.
Another cheap way to have hours of fun.

Crumpled tin foil.
See milk rings!

A stethescope.
I have one and love to sneak a listen to the inner workings of a purring cat.
It's pretty fricking wild, check it out.

A laser pointer.
Good for a laugh and kitty exercise.

Night vision scope.
Pricey, but a huge ball of fun. If you get the kind with the infra-red flashlight? Even better.

Super Glue.
If I have to explain.....

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Any of the above will provide you hours of fun with your cat.

My faves are the stethescope, laser pointer and night scope.