Insulated bottles that fit into standard bottle cages hold less water! I generally start by filling my uninsulated bottle with ice cubes then fill to top with chilled water (and do this just before leaving on my ride) 😎. To be sure, by the midpoint of my ride, most of the ice has melted but the water is still refreshingly cool. I don’t worry so much about the temp of the water at the end of the ride as it is, for the most part, gone by then. Hydrating early is much more important than at the end. Plus, other than a degree of “cooling effect”, metabolically the body treats water the same regardless of temperature. Whether water is warm or cool, within a very short period of time it equilibrates to body temp!