Let me tell you where you'll be having lunch on the way up (and probably on the way down too!) As someone who travels about half that trip almost weekly during the summer, I am very familiar with your gluten-free options towards the north. Sherry Lynn's Gluten Free Bakery and Cafe is located just off exit 6 of the Adirondack Northway (I 87) that's a few minutes north of Albany. It may well be the only 100% gluten-free restaurant in the USA. It is a very laid back, kid friendly place. It has a full bakery: breads, rolls, cookies, DONUTS!, etc. It is a cafe: sandwiches, salads, soups, entrees. It also has a small grocery section with a great selection.
Trust me, if you are passing by you MUST stop there. It is my favorite place on the drive.