Well, I'm not sure about the possible reception in Singapore,
but in Germany there's a pretty common interesting and convenient
way to sell alcoholic drinks. They store all the different types of
drinks they have in giant transparent jars, while the whiskys,
wines and brandies are in their casks. The customer purchases a
bottle from the shop, or brings his own. Then he chooses which
drink he wants and what quantity, then the salesperson or
shopkeeper just fills the bottle for him then he pays.
I thought this is really interesting as there's a great variety of
choice, as the customer can actually taste before buying, and it's
also a very flexible system, and saves cost as well, since the
customer can bring his own bottle.