Indeed, there are dozens of companies filling and distributing bottled drinking water. But in the judgement of this author, Polaris is still the best. Bottled drinking water is sold anywhere in Bangkok in small and large shops, by street vendors and in restaurants. Occasionally, there are bottles for sale containing just about half a liter. However, their price is usually only insignificantly lower than the price of liter bottles, for example 4 Baht instead of 5.
Water sold in glass bottles is always more expensive than water in plastic.
Bangkok Tel 259-0620 to 33 Classes are usually conducted in Thai but for a group of at least 4, lessons can be obtained in English. It is best to organize ahead of time what type of course one would like to have taught. The school trains in a wide range of international cooking, including Thai, Chinese, Japanese, as well as in fruit carving.