My Dad lived alone for many years, and was very independent in his nature, which intensified as he aged.
Eventually, we all lived together, yet he retain his independent habits for as long as he possibly could. He didn't like to be bothered by the physical constraints of life, such as eating, as it was inconvenient. He had places to go and things he wanted to do. So, after cooking for himself for years, he had devised a system.
When he went out, and knew he'd be gone long enough to need a meal, he didn't want the fuss of sitting down to eat at a restaurant. He would bake a couple of russet potatoes, wrap them in foil, put them in his pockets and head downtown to take the Metro subway to parts unknown, completely self sufficient. This went on for years. It was amusing, and yet, one didn't dare kid him about it, too much.