These bottles are no longer made.
The SB-2R filter does fit some of the Brita water bottles. You'll want to look at your current filter to see if this one is a match:
http://www.waterfilters.net/Culligan-SB-2R-Water-Bottle-Filters_p_0-266.html
If it is not, then the only other option is to buy a new water bottle since no other replacements are made that we know of.
All of our water bottles are located here:
http://www.waterfilters.net/Filters/waterbottles/sportbottles.htm