Keep your bottles honest and the book tells you what is ready to pour. When nothing suggests itself, say what you are in the mood for and the back bar answers with three drinks you can actually make.
Every bottle and how much is left. One tap after you pour keeps it true, and everything else in the app reads from it.
Your recipes, each marked with whether you can pour it right now — and if not, which bottle is in the way.
“Like an old-fashioned, but summery.” It answers with drinks built from your bottles, and says why each one works.
The sugar is just changing costume — peach carries the same weight demerara did.
Bottles that are out or running low, and anything standing between the book and a drink — each line saying which drink it is holding up.
A bar is the thing you share, not an account. Send whoever pours with you a link and you are both looking at one shelf and one book.