The only two ideas I can think of for supplying food is to load your trunk with food and keep the trunk open, or ask those people with portable snack stands and food carts, to come and join a protest.

I think the snack stand idea is a pretty good one. It would make our protests look better, it would increase our numbers, and it would be good for the stand’s business. Though it might conflict with boycotting if it happens that the snacks offered there are boycott targets.