if you're patient enough you could evapourate the water and be left with the codeine. i know i can't do that
i've actually been leaving my mix, before i've extracted it, in the fridge over night and filtering and drinking it whenever i need to dose. this has been pretty damn efficient because all the apap/ibuprofen settles to a nice sludge at the bottom of my cup so i can filter what is already as clear as solution possible.
i nearly spewed up an extraction this morning because i was thinking about the taste and started gagging

. everything went well with what i just downed though. mixing it with a little GFJ kill some of the taste as well; i'd already drank a cup beforehand for potentiation.