Add a way to create and save your recipes, add missing ingredients to ingredient list (for example there is not dragonfruit juice),…. Also to be able to share the recipe with others (button to publish it or at least generate link for your recipe).
I also think it would be good, if you could “modify” any existing drinks (and it would create folder in your collection called “your modifications” or something like that).
So far your app is good, and I’m looking forward for future updates.