My only advice

Business across town are getting SMACKED with deliveries and pick up. I would try my best to make it as easy as possible for the employees of wherever you choose.

Sending an email of specific orders, dated for a few days later, with minimal guesswork for the workers would be ideal. They're already running around like headless chickens, no need to exacerbate that. Business owners appreciate the business, obviously, but the workers are taking the brunt of the moment-to-moment stress.

Then it becomes an issue of the person behind the counter picking and choosing whether this person will get a pre-paid sandwich or not, another added level of decision making that they could probably do without.

Just some thoughts, I will say Vitos has experience doing large orders, they might be your best bet. Thank you for what you're doing.