This may sound odd, but freeze seedless grapes. Stick them a zipper bag and put them in your pocket. If you have to, order something light & just tell them you're not very hungry, but will gladly take home whatever you don't finish. And when you can, pop a couple of frozen grapes in your mouth. They are incredible for hydration and giving you a little something to keep you from getting weak. I don't go out & haven't been in a group setting so food hasn't been an issue for me. But I learned the grape trick when my daughter and I were seen in the ER with a NOROVIRUS strain that as the dr said, was the strain that was docking cruise ships along the coast.