I got a filter bottle when I went to China.

http://www.backcountryedge.com/katadyn-e...;utm_medium=cpc

This one is a 3 stage--filters, iodizes, charcoal.

Look like a regular water bottle so you can even dump your
glass of water from the cafe in it and it looks like you
are just saving it for later.

I had someone write "water filter" in Chinese on the outside
with a felt marker so the customs agents would know what it
was.

The good thing about it is you have instant water to drink,
the down side is it take a little bit of force to suck or
squeeze out the water.