A Deep Fried Bird requires not a frying pan or some open fire, but a boiling cauldron with water. Looks strange to me, though I'm no expert in cooking, isn't it will be boiled?
Maybe this is somehow connected with having two liquids in said recipe, so people want to hold 2 buckets and thus have no free hand for a pan, but if the such dish really supposes frying, it seems preferable to have a not very comfortable recipe over the wrong one.
P.S. Just checked. I can't pour Vinegar even in a Mug, let alone a Waterflask/-skin. Why? It seems possible to get Tar out of bucket and use it for Batter, or pour Wine in and out after storing Tanning fluid there, what's wrong with Vinegar in a flask or a Mug? Now I left some juice in them to see whether Vinegar can exist there at all...