But is that wise Christian as surely it's not so much about you perhaps building up a resistance to certain germs in the water perhaps ( which can happen of course) but more that there are such a wide variety and number of possible different germs that could be in the tap water there at any time that's the issue. I'm maybe wrong but I dont recall seeing many Thai's drinking the tap water with abandon ?? ( or I I wrong there ??) I certainly brush my teeth with the tap water there but I wouldn't like to be sitting down and drinking pint glasses full of the stuff everyday ( if that's what you're suggesting you do ??)