I have had Ds1 in a low or no gluten diet for at least 3.5 years. It's easy once you manage the first few months.

It's back to basics. Baking your own cookies and cakes from scratch. For lunchbox goodies - he takes two apples, a tub of mixed fruit, a packet of plain chips, sometimes carrot or celery sticks with home made dip (he doesn't eat dip but that's what I would do).

There are plenty of GF options out there. Good luck.