I personally couldn't eat most of what others do and usually nothing that is served at these activities either. Bread which now has tons of preservatives, wheat, dry cereals with all those preservatives
I can eat applesauce, which comes in nice little containers - but get only the ones without anything added!
Activia yogurt is the only brand I can eat.
Pears are generally tolerated better than apples, but you might have to acquire a taste.
Other canned fruit without added sugar - not the little cups with preservatives, but put in your own little containers.
Oat and honey bars, but not any with dried fruit or chocolate or too much corn syrup - try individual ones at home
Boost High Protein vanilla, but not chocolate, strawberry or any other brands, no other styles - too many additives!
little containers of cooked oatmeal - not the instant stuff with additives White sugar only, add when you eat.
little container of plain white rice with a little butter and salt
I can make a chicken or beef (slices or chunks) salad with no dressing, keep that separate. I like fruit - pear or apple without skin, cranberries, sliced almonds. Needs refrigeration.
When cooking chicken you can add 1 or 2 individual spices, not mixed. AVOID lemon pepper! Add salt to meats after cooking to avoid shrinkage.
Keep some little wrapped plastic spoons in your purse.