[*]Limit resting to safe areas [*]Limit saving the game to long rests, no quicksaves allowed [*]Make supplies harder to find, make them rot, or simply Increase the number of required food to rest [*]Split required resting supplies between edibles and liquids [*]Using Teleportation circles requires you to be standing next to one
I've said this in EA, I will say it again. With the way the game is designed(some plot\companion story related to long rests), there should be camp places alongside with teleportation circles. So you can make long rest only when reach them and on hardcore mode game should make a save there. Meanwhile, supplies must be spent on short rests instead of long rests.