Hi i am in need of desperate help

I need help to think of things to send to school for my 5 yr old DS.
ok firstly he is lactose intolerant, so no cheese, yogurt, custard.
secondly the school has a no nuts policy.
thirdly the only fruit he eats is bananas, unless its something in cooking.
ok and just to add to all of this he has a lazy bowel too so we have to limit foods which may bind him up, and also his teacher is really into the kids eating healthy, no chips etc . and the school has no canteen. I am desperate.
What can i give him other then Vegemite sandwich