The local Ace Hardware (Montgomery, Illinois) has a sale
on Culligan filtered water bottles (28 oz and 16 oz)
for $1.00 each. Other Ace Hardware stores may have
the same sale.

They fit in a bike's water bottle holder bracket. Here's info
on the smaller bottle:

http://www.culligan.com/product.asp?ProductID=144&Section=4

I don't think they are as high a quality as the ordinary $5 water
bottle sold at the LBS, but these have a filter and are only a dollar.

Here's a photo of the smaller bottle:
http://www.culligan.com/product.asp...D=144&Section=4

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Bob Parnass, AJ9S GNU/Linux User http://parnass.com