The Word of Wisdom is understood exactly as stated by the Lord in D&C 89. It is a health law which was given not by way of commandment, by simply as a word to the wise. Alcohol is not good to drink, smoking and chewing tobacco can be harmful, fruits are best eaten in their season, and go easy on meat in the summer.
While "hot drinks" have been interpreted by the corporate LDS church to include even iced tea and iced coffee, that is not considered to be a revelation.
Following the Word of Wisdom is not a requirement for being confirmed a member of Church, but rather just a wise path to choose.