In out of the Abyss, one of my characters requires an item yet you start with confiscated items. What should I do?

I am running Out of the Abyss, and there is a cleric in my campaign. This cleric requires his holy symbol to really do anything. However, you do not start with any items in this. I don’t know what I should do about this. Should I give him the holy symbol? Should he find it in a shop? Please help me out.