Hard cheese packs lots of cals, protein, and fat into a small pkg. Vegetable juice will balance the diet and add essential minerals lost in sweat. Cheap cookies for variety and quick energy.

Being a social creature, I have taken advantage of homeless shelter food kitchens. Made a small donation and ate well. Some churches have readily available funds for aiding transients, if touring times get really tough. I've even heard of them springing for a motel.