The large copper pot was something she had found in a junkyard and bought with her own money. Its cylindrical shape didn't require a stove, and could be heated directly from the bottom; it could be accurately described as a tea brazier.
Since her own family had an iron pot for boiling water, she handed this copper pot to the children, along with the earthenware pot she used before she had the iron one.
She also brought a machete for Jiang He to defend himself with.
Even though large wild animals are rare in the mountains, it's essential to take preventative measures ahead of time to avoid panicking in a crisis.