As others have said, treat the water by simply sloshing water on the water bottle and lid threads. Works for me and untold numbers of hikers and outdoors people around the world...

I use the brand of Aquatabs purification tablets. These only need ~1/2 hour to treat the water. In Canada, the tablets can be found at MEC where they cost $8.75 for a pack of 50 (expiry date 2014) and each tablet will treat a liter of water.
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.

John Lubbock