Comfort

The touch of a warm hearth blossoms from you, stirring the hearts of your allies and steeling them for the journey ahead. Select up to six willing creatures within 30 feet. For the duration, an affected creature gains advantage on saving throws made to avoid the effects of extreme heat or cold, gains advantage on saving throws made to avoid exhaustion, doesn't suffer the effects of breathing at high altitude, and requires only half as much food and water as normal (as per Dungeon Master's Guide, chapter 5, Wilderness Survival).

In addition, the first short rest you take during the spell's duration takes only half as long, and an affected creature gains an additional 2 hit points for every Hit Die they spend.