The explorers camping kit is probably the most egregious of the "DLC"
So to explain, as you and your pawns battle you take damage, take enough damage and there is a portion of your HP you can't recover with magic or items. So you'll either have to go rest at an inn or find a bonfire to set up camp. To make camp you'll need the camping supplies item, the ones I have found so far are very heavy in weight, which means your party won't have much space for loot.
The explorers camping kit DLC will give you 1 camping supply and make the "explorers camping kit" available to purchase within the in-game shops, and it will be much lighter in weight than the normal camping supplies. Capcom have purposely made the experience far more tedious than it need be in their fully priced AAA game so we would spend the extra money on their quality of life DLC.