By a Campfire on the Trail

 is a quest in Fallout: New Vegas.

Detailed walkthrough
After finishing the quest Back in the Saddle, this tutorial pops up saying that Sunny Smiles can show you another trick on surviving in the wasteland by using campfires for basically crafting complex items. '''However! If one wishes to end the tutorial right there then this quest will not be able to be performed!''' Anyway, you start off by being instructed by Sunny Smiles to retrieve a Xander Root near the abandoned school house(CAUTION: The school house is a home to Mantis) and to retrieve a Brock Flower from the Good Springs Cemetary (CAUTION: The Good Springs Cemetary is home to various Bloatfly where our protangonist was coveniently buried and left for dead. After retrieving both items, the courier meets Sunny Smiles at the campfire which is in the same vicinity of which the Good Springs water source is where the courier previously fended off mutated geckos. When arriving, talk to Sunny Smiles, then go to the campfire to make Healing powder. When this quest is over, head over to the Prospector Saloon to talk with Trudi.