Circle of the Land - bg3.wiki
Wizards can restore some of their Spell Slots without needing to camp (out of combat).
Baldur’s Gate 3: How to Recharge Spells and Attacks - Game Rant
Level 3 Spell Slot While this aura lasts, you can cast Restore Vitality as a bonus action to heal yourself or nearby allies.
Baldur's Gate 3: Best Wizard Class Build - Game Rant
A Long Rest will also restore Spell Slots and Actions. Some Actions and specifically a Warlock's spell slots, however, only require a Short Rest.