Welcome Sgt. Porter and thanks for asking the question.
First of all, the policy of this site is not to provide answers to specific actual halachic (Jewish law) questions. So, you really need to be directing your specific question to the Orthodox Rabbi associated with the Kosher supervision for your institution. I am sure he will give you a quick answer that can be applied to your unique set of circumstances.
If you do not have such a contact at this point, the following link is to an organization connected with the work of the Lubavitcher Rebbe that works with prisons and Jewish prisoners and their particular needs. You can find whatever help you may need there.
That aside, in terms of kosher supervision for the types of products you are describing, there is a potential issue in terms of dividing portions from a bulk package and it revolves around the idea of chain of custody in terms of evidence. Who can supervise that evidentiary chain according to Jewish law and the particulars of what must be done would be something you could discuss with your supervising Orthodox Rabbi.
It should not be complicated and might even provide another type of work program for one or more of your Jewish inmates.
May G-d bless you to be safe and successful in the work you do. Part of the process of incarceration is the rehabilitation of your inmates. That includes to a large extent their spiritual rehabilitation. Spiritual health is the root to both physical and psychological health.
The Torah teaches that properly supervised Jewish milk has a powerful effect on strengthening and healing the faith of a Jew like is found in Igrot Kodesh of the Lubavitcher Rebbe and also in Igrot Moshe of Rabbi Moshe Feinstein. This, in turn, helps them to make the proper choice for life and for true good.
To that end, you are serving a vital role in helping these individuals to return (what is called in the Torah teshuvah, return) to the correct path both with their fellow man and with G-d.