The bottle contains the holy dirt from the Santaurio de Chimayo. Thousands of people make pilgrimages to the church each year and collect the Holy Dirt which many people attribute as possessing remarkable curative powers. Bottles can vary in size and may be smaller than the one in this image.
The Chimayo legend goes: As the legend goes, back in 1810, on the night of Good Friday, Don Bernardo Abeyta was performing customary penances in the area, when he saw a light shining from a hillside nearby. When he arrived at the source of the light, he saw that it came from underground. So he dug with his hands, uncovering a crucifix. When he told the priest in nearby Santa Cruz about the discovery, a group of men came down to see it, then carried it back to the parish in Santa Cruz. The next day, the crucifix was gone, and and ended up right back in the same place where it was discovered. After a 2nd & 3rd procession, which ended with the same results, the church finally understood. The crucifix wanted to stay in Chimayo. So, they built a small chapel there.