Well, there's probably a bunch of ingredients most folks will have in their larder/pantry cupboard e.g. salt, pepper, vinegar, one or two jars of spices (say, chilli, paprika), stock cubes... the sort of thing you can easily pick up from a regular supermarket or your local 7-11.

The more "exotic" ingredients would come with the box. For example, I'm kinda rural, so fresh herbs such as coriander and parsley aren't easy to come by. Fernly is suggesting that company's like Blue Apron should recommend always stocking certain long life standard ingredients that are commonly used in their recipes. They could perhaps even have this as an option on your account so that you get a bit of a discount for agreeing to hold these ingredients rather than having them sent out in tiny amounts in wasteful packaging.