Tap water in Myanmar is not safe to drink, likewise ice may be contaminated. Bottled water is readily available at many tourist sites.
Similar to ChineseTea' Yenwejan is usually provided free at restaurant tables. While not flavourful, it is boiled water, and so safe to drink (do not drink plain water - even in restaurants - unless it is bottled water). Dried tea leaves similar to Laphet thote's tea leaves (except these are wet) are added to the boiled water to give Yenwejan Be sure to order it with Laphet thote (Customary/Good combination).
Alcohol is frowned upon by conservative Buddhists, Hindus, and Muslims, but consumed widely, mostly among men. Myanmar Beer (lager) is most popular in the country. Other variants, including Mandalay Beer exist. However, many of such companies are government-owned and/or have links to the drug trade. Toddy juice (ta-YEI) is popular in central Myanmar, and is made from fermented palm sugar. An alcoholic drink popular in the Shan State is Shwe le maw, and is reportedly very strong. It is also possible to buy full strength Beer Chang imported from Thailand; exports to most countries are not nearly as strong.
Beware of alcoholic drinks served in the far northern states. The locals refer to it as alcohol which does not burn when lit, and it is widely suspected to be an opiate concoction rather than a fermented beverage.
There are a lot of nightclubs, including those attached to the five star hotels (eg Grand Plaza), and also local entertainment centres (eg JJs, Asia plaza).