On https://foodsharing.de, you can sign up to see a map of food items that people want to give away. During the pandemic, these will often be in boxes, either outside, or in buildings' entrances, which you can just go and collect!
And if you want, you can help out in this second layer, as well! I missed this when I first checked out the website, but this wiki is the entry point – you'll want to become a "foodsaver": https://wiki.foodsharing.de/Foodsaver
chaos.social – a Fediverse instance for & by the Chaos community