My big 3 needs while I was there were:
Given that this is a Church function, smokes are out of the question.
Also while I was there baby wipes were a nice thing to have if you were to be out in the field for a LONG time. I was there before we had bases and showers.
Quality TP is a God send, not the itchy, rough, card board type TP that you'll find any where else in the Military.
Granola bars, "sports" bars, and beef jerky are wonderful items, you want to send stuff that's portable, and will last forever...add trail mix to the list.
No contents under pressure, shaving cream, soda etc. if being shipped in a non pressurized plane, they may explode, trust me on this one.
Bottles of Gatorade should be ok.