I do a similar thing with Trello.com, in fact the whole house hold now uses it (mostly through the mobile app) to manage shopping lists (supermarket/garden/farm

I do a similar thing with Trello.com, in fact the whole house hold now uses it (mostly through the mobile app) to manage shopping lists (supermarket/garden/farmers market), upcoming 'events', House Jobs, House Projects (which can evolve into their own boards).