I thought you might like to have my present perspective on this problem of clean water.

Thailand has had a major problem with availability of clean water in the past. The water from the taps is safe to bath in and to the best of my knowledge there is no biological problem with most of it, particularly in Bangkok, though the only time I have gotten sick in Thailand it was after having made a mistake early on in my stay here and diluting something with tap water.

The problems with WDI have been solved in a few ways.

• Bottled water is readily available and inexpensive. I get 20 liter bottles of water delivered to my apartment on the fourth floor (with no lift) for 15 baht (less than 30 cents) and I can get a 500 ml bottle of water at a restaurant for about 7 baht (less than 15 cents).
• Education on proper sanitation and cleanliness is universal.
• Thailand has a relatively new health care provision system that seems to be pretty effective, providing health care for any problem for 40 baht a visit ($1).

I'm not sure how useful that is to everyone.