Help with making a Splash Potion-like item

So I am developing an item similar in function to a splash potion/lingering potion. It is called Bottled Steam which is tossed onto the ground creating a cloud of steam that sets anyone who comes into contact with the cloud on fire. The bottle is broken when tossed like a splash potion. I am not experienced with making these types of items work so could someone help me give me any tips on making items like this.