We’ve just finished the walk. Really enjoyed it, varied scenery and the weather pretty good too!
One of the B&Bs we stayed in offered camping, not sure what facilities they have but I think you can get a meal if you prebook. It was Partridge Arms Farm, Yeo Mill, about 10 or so miles after Witheridge, on the edge of Exmoor. You’ll like the Drewe Arms in Drewsteignton, it’s a great pub set in a lovely square.