This is how you can heal up your party without resources in between battles.
You need a Paladin with the "Flesh Restore" ability in your party.

How it works:
After a battle or when in need of healing, right click, choose the Paladin and click the "Flesh Restore" icon.
Heal a party member.
Then go to the Paladins inventory, his Book of Mastery. Exchange "Flesh Restore" with another ability. Then swap back "Flesh Restore".
Click "Confirm".
Close Inventory.
Heal again.
Then open the Paladins inventory again, Book of Mastery ..... swap swap, confirm, close, heal..... and so on and so on.

Basically you have with this little trick unlimited Paladin healing spell points outside of a battle.