it is the same with
whatever you are drinking. During the meal, when your cup or glass is
less than half full, your host or neighbor will refill it. it is polite to refill your neighbor’s glass. This means that you should keep an eye on your
neighbor’s glass all through the meal. The most important place at a table is at the middle. An important
guest will sit at the middle of the table on one side, and the host will sit
at the middle of the table on the other side. This may be confusing
when the table is round, but the Thai get it right somehow.