Rations-How do I collect them?

I have collected plenty of food items. How do I create rations from them so I can rest in dungeons?

Rations can be bought from vendors and found as as part of the loot inside containers throughtout the gameworld. They however cannot be created by the player.

Food items on the other hand are used in cooking while camping. Each companion has their own favoured dish you can cook via learning from recipes. Those grant an extra buff for said NPC’s. This is a seperate mechanic from rations.