Maybe this has been asked before, but I could not find an answer. I am about ready to fill and Animas cartridge for Carter. I have a little bit in one vial that is not yet expired and I would like to use it up, but it will not be enough for the cartridge to fill up for the next few days. I have tried this before with too many bubbles--taking insulin out of 2 vials for one cartridge. Is there some trick I am missing? Or is it better to just take the rest of the vial and then just replace the cartridge tomorrow night or the next morning when he runs low on insulin?