>>592863The Schwarzwald should be stunning this time of year. Definitely take some quality rain gear though. And don't rely on finding wood, all you can count on is twigs. Not that you can make fire or camp anywhere but at a Campingplatz...
I don't know what a rat pack is beyond a group of Swing singers. But I will assume you mean portion packaged trail food. You can get that stuff at any supermarket, the packaging is a popular eye catcher. If you can find a Reformhaus (organic drug store) you will be swimming in pricey granola bars, smoothies, salami, biscuits, and energy drinks. There's 2 kinds of normal (non organic) supermarkets, brand chains, and discount chains. The discounters have a limited product range but have better quality and much better prices. The brand stores like Rewe have any instant food you can get, and may I suggest 5-Minuten-Terrine (just-add-hot-water - cup) mashed potatoes and meatballs.
But why would you? There's homely taverns in every village and Straußen (roadside inns) in between. If you go to any butcher shop they will gladly sell you fresh quality meats in the same price range as the nitrate covered foodlike product from the supermarket. And they'll even vacuum seal it in portions if you request it. Now the bakery won't vacuum seal, but buy a Bauernbrot, it's delicious sourdough and it keeps for a week if wrapped in paper. Now all you need is a Wochenmarkt (street market, weekly, ask a local) to get some quality pickles or chutney.
You could even do it old timey with a loaf of bread, a paper wrapped piece of cheese, a thick slice of ham, an apple, and some candy nuts in a tin. But you'll have to bring your own water skin because the ones you can get here are cheap plastic covered in hide imitate.
But seriously, any German supermarket will have any food you need in whatever packaging you prefer, as well as batteries, tissues, and possibly gas cartridges for your camp stove.