If you are going to use the Britta Water Bottle at WDW parks, then just buy one of the straps they have at the parks for water bottles. You can find them anywhere there is a cart selling bottled drinks. They weren't expensive either, according to www.allearsnet.com they only cost $3.09. That's what I did and it's a wonderful souvenir! It works great, you just adjust it to fit your size of water bottle.
You can see them at Brita. Filters are replaceable, and they hold about 20 oz. Sizewise, they are about 2 inches taller than an Aquafina 20 oz. water bottle, and approximately the same circumference.
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