Drinks

Don't drink tap water! You can get a 600 mL bottle of water for just 6 baht or a 1.5 L bottle of water for 17 baht, but if you want to save money, you can refill your bottles at water refill stations that are everywhere around town for (sometimes less than) 1 baht per liter ! Have a container ready, put a 1/5/10-baht coin in, and simply press the green button to start/stop.

Juices and smoothies range from 25-60 baht. Drinks from the convenient stores or supermarkets are cheaper of course. Beer is at least 50+ baht. Cocktails, 70-100+ baht.
Drink of choice... Thai Iced Tea, cheap cheap 14+ baht from 7-11!