You can only give a kiss of alcohol to dairy. If you add anymore than a kiss the dairy will curdle and you won't be able to drink it anymore. Bleh.
Dairy isn't kept with other drinks, it needs to be placed on a rack (らく). I hope you've been using your dairy rack to store your dairy. If you haven't you should get one right away!
Currently there are no similar looking kanji which exist in the WaniKani learning system