Bike shops sometimes have their own "branded," dime-a-dozen plastic water bottles. Cheap as dirt (I may never have actually had to pay for one, now that I think about it.) and they meet my needs:
Holds water? Check.
Dispenses water? Check.
Fits in cage? Check.
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A race bike in any era is a highly personal choice that at its "best" balances the requirements of fit, weight, handling, durability and cost tempered by the willingness to toss it and oneself down the pavement at considerable speed. ~Bandera