Missing ingredients ranked by the well-rated drinks each one alone would let you make (swaps counted, garnishes ignored). Tequila is never suggested. "Not buying this" keeps the shelf lean.
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Keeps bar marks, added bottles, your recipes, favourites, made-it log, shopping list and "not buying" in step across your devices, through your own Google Apps Script. Each item merges on its own, so phone and laptop never overwrite each other.
Export saves everything you've changed as a file. Import merges a file back in, item by item.