@brittarnhild
All along our long country you find them, out in the wilderness, the cabins belonging to Den norske turistforening, The Norwegian Trekking Association. Follow the red T´s, and after one hour, two hours, eight hours, a day.......you are there.
The cabins are open for everyone hiking to them, though most of them are unmanned. The key is "in the door" (you actcually have a standard key if you are a DNT-member) , you can buy food and leave your money, you can find a bed, or you can just pass by.
Terje and I hiked to one of the hundreds of cabins today.
To Imarbu
You can read more about Imarbu here, sorry, in Norwegian only.
We hiked with a backpack, brought our own food and enjoyed lunching down near the sea.