 Just make sure that the can that you get has one of those openings that you can open the can. You don't have to have a can opener. And the bottle of wine, you might find it hard to get a screw top in France, but, you know, you could search and search for one. It's an excuse to buy a corkscrew as a souvenir, I suppose. And travelers can do that, sit down on a free chunk of the riverfront and have their own picnic.