Saying "No crisps" does not make them Nazis, with or without an apostrophe.
The school does not know in advance which parents give their children varied healthy diets blah blah blah and which would happily send their children to school with a can of coke, a Mars bar and a packet of Monster Munch, so they send the healthy packed lunch info to everyone.
A wrap, roll or sandwich with ham/cheese/hummus with grated carrot or shredded lettuce/vegetarian pate/cream cheese with cucumber/ tuna and sweetcorn/ egg and cress etc
Some veggie nibbles like carrot or cucumber sticks, cherry tomatoes, a couple of cocktail sausages, falafel, cubed cheese, couple of olives, or fruit - grapes, melon cubes or a few slices of apples or satsuma, pineapple lolly, raisins, sultanas, dried apricots etc.
Small pot or tube of fromage frais or yoghurt.
I found that they don't have that much time to eat their lunch and they would never manage a whole apple, or more than one sandwich, so I would keep the amounts small and varied. One little sandwich or roll and a selection of nibbly bits plus the yoghurt. Not usually necessary to send a drink - they get water provided.
Some schools are stricter than others when it comes to sweet things. If the children have a school lunch they can have a pudding, so it does seem ridiculous to object to a small slice of homemade flapjack, for example, so I would ask them about that. I wouldn't send biscuits or anything with chocolate on though.