The potions textbook was the instruction manual for the party. It holds instructions for casting spells with your wand to open the potions cabinets and to activate the mixing stations. And most importantly, it holds the recipes for all eight possible drinks.
Coming up with the drinks was a challenge. We knew we wanted a Harry Potter twist on a few standards such as the Martini and Manhattan. We also wanted to do some more interesting custom drinks. But due to limited cabinet space, we needed the Venn Diagram of all ingredients to overlap as much as possible! You can see a little more detail on the GitHub README page for the drinks.
(Note: these have a “folded booklet” or “zine” page ordering and may not be straightforward to read on the web.)