Sorry you didn't get any replies before going shopping...
I'm not sure if your DS (DD?) has any texture issues?
Is this for lunch at home or to pack?
Some things that pop into my head
- leftovers (rice, beans, lentils made in various ways are great the next day)
- hummus, baba ganoush, avacado dips with veggies, or even spread of some GFDF bread as a sandwich
- egg salad, salmon salad
- salmon burgers
- meatballs in sauce (if you have a container to keep it warm, if you're out)
- soups (meat + whatever veggies are not "yucky")
Have to run, but hopefully those get you started?
Good Luck, it's overwhelming at first, but it gets waaaay easier as you go. Look out for hidden ingredients in processed foods.
Get your 2 yr old to help you in some baking (GFDF) adventures - always perked my picky toddler enough to try some new things while having fun :)
There are lot's of great GFDF blogs out there (can come back with links if you like) so you don't have to experiment too much.