>>489395Op here. Yes. If you need a route, walk the Hexenstieg, it's perfect for a week and it really is awesome. I walked it many times and will do so again this year.
I personally like to walk out of the season in fall, less bugs, less people, not so hot and going through one of the wildest forests in germany in the rain or fog is just my thing.
The Hexenstieg is a popular route and you'll have the possibility of a room every 20 km or so. I personally sleep in the wild or huts along the way, but technically that is forbidden.
If you camp wild, make it stealthy. The Harz mountains will be cheaper than the Alps. If you use a map like Osmand on your smartphone you'll be able to restock at cheap supermarkets, they are all listed.
Plenty of water on the trail. I never drink it unboiled, but it's free of any nonbiological contaminants.
Pic related, it's a pond at Clausthal-Zellerfeld, where i met Clausthalanon.