What is this frozen water jug trick you speak of? How does it work? Do you wrap the jugs in multiple layers of bikinis to insulate them? Is some sort of refrigeration device installed inside of the jug?

I look forward to your answer as I'm getting tired of having to pound down frozen Margaritas because they become unfrozen within five minutes when sitting on the beach. Hopefully the refrigeration device can be transported on my scooter as parking a car is problematic with all the tourists flocking to the islands from frozen wastelands like Wisconsin.