When I did MV the first time as an Iron Butt in August ('12???)it was right at 100* and I used a CamelBak. That thing was (probably literally) a life saver. At each gas stop I would fill it (with permission, usually) with ice from the fountain drink dispenser and then top off with water. With its attached hose I was able to sip ICE WATER any time I wanted while riding, and it was heavenly. The ice would usually last between stops.
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