How To Wean A Kitten Off The Bottle?

My cat is 7 1/2 months old and he loves to drink from the bottle. I would like him to be on a diet that does not have any milk or other animal products in it, but do not know how to wean him off of the formula without either leaving it out all day long for him to eat (which makes me feel bad) or having someone else feed it occasionally..

He has been taking this formula since 2 weeks old, so I am wondering what kind of diet will help? He is still very playful and energetic. He was just diagnosed with pancreatitis last week, so I want his health issues under control first before starting medication