Which is the adjective phrase in the sentence?
on an overnight hike, bring warm sleeping bags with heavy lining, and make a fire before dusk.
a. before dusk
b. on an overnight hike
c. with heavy lining

so whats the question?

voracity is the noun corresponding to the adjective voracious, which means (1) eager to consume a great amount of food, or (2) marked by an insatiable appetite. veracity is far more common than the rare voracity, so the latter is sometimes used in place of the former.