I've spent time in Bangkok for several weeks now, and although it seems like it is safe to drink, I've talked to a lot of locals that are buying bottled water too.

Also, the smell of chlorine, when you turn the tap on, is enough for me not wanting to try it.

that's not true. There are only a few countries in south-east asia with drinkable tap water: brunei, hong kong, japan, singapore, and south korea. You should probably not have drunk that water in Bangkok.

Even within a country, whether a specific city has potable water or not can vary. Bangkok technically has potable water from its source, but the pipes it might travel through can be broken and dirty (the same is true in Beijing, actually). In this case, you can get lucky...but it is better not to chance it.

Tap Water is not drinkable in beijing. I used to live there.