The collection is called Heroes' Feast, which also happens to be a spell in D&D which can feed a large party of adventurers, and has been written by Kyle Newman, Jon Peterson and Micheal Witwer.
The Potion of Fire Breath is an uncommon D&D magic item. The Cocktail of Fire Breath is a real-life thing, but even rarer. Fortunately, Hendo Arts is here to show us to do it.