Dear L.,
I hate to tell you this, and I could be wrong, but from what I have heard of the Daniel Diet, it has to do with fasting or refraining from foods. I found the following on a web-site:
Some practical advantages to fasting like Daniel include: re-evaluating your life, identifying with those who are poor, losing weight, worshipping God, breaking bad habits, growing closer to God, family and friends, learning self-control, purifying your body and soul, and repenting of sin.
Caution! The Daniel Fast Diet like any other fast can create problems for people with medical conditions, pregnant, nursing and/or taking medicine. Consult your doctors and/or pharmacist before starting any fast. Ask them about your medication while fasting.
You may want to ask someone in your church if you are to be held to Daniel's Diet because that's what someone else follows, if this is part of bible study, or what.
If the church is standing behind the Daniel's Diet, then I don't think you need to worry much about feeding anyone. And if it's just one person, then bring what you want. I definitely would ask your bible study leader what this is about before you try to comply.
Just a suggestion and no offense intended.