To discipline your cat, never hit it. Instead, some people suggest spraying it with a water pistol although others prefer more passive deterrents such as sticky tape. Still if you’re going to use a water gun, you might want to know which ones work best.
Generally you want a water pistol where you can easily find and use it. Best of all, if the water pistol works with your cat, you might consider bringing it to work to help train your co-workers as well.