The kids were in last week, and evidently they forgot about a quaint custom we have here, the drive-thru daiquiri shop.
Here's how it works. The business gets a liquor license and buys the equipment. The customer drives up and orders. The bartender makes it up and puts it in a container with a lid. At that point it is package liquor. The customer gets a straw as part of the package. As long as the straw is not in the lid, it is not an open container. What happens after the customer leaves the parking lot is between their conscience and the local constabulary. You are on the honor system.
In the photo above, that's my daughter-in-law rediscovering the joys of a drive-thru daiquiri shop. These things are all over Louisiana and do a thriving business. Even at 1:00 on a Wednesday afternoon.