While some of the rooms branching off the cellar have a delineated purpose -- the dusty library, the kitchens, the vault -- most are Skyhold's equivalent of a junk drawer. It isn't hard to find some crates that can be commandeered into makeshift chairs and tables.

One of them is marked with an arrow pointing toward the ground and the upside-down words THIS END UP. Alistair heaps the tea and porridge upon that one. Another had its top pried off long ago; he goes to investigate, rummaging through its contents and pulling them out one at a time.