Ok. What about this?
SR = reset special abilities and warlock spell slots, etc,. Lift the limit entirely. No 2/day. You can SR as much as you want.
But it doesn't heal. 😮
Now, go back to food heals, but it ONLY heals outside of combat. 1 Camping Supply = 1 HP healed.
Now, add to this Long Rest requires the same amount as SR, basically 1 Camping Supply per 1 HP, but it costs an additional 40 because of spell slots, etc.