I thought I was alone out there. Here in Queensland, summer lasts for six months, and there is no such thing as winter. If I refused to ride in the heat, I don't think I'd be very fit. As far as what to eat goes, I live mainly on fruit and vegetables at that time of the year (yeah, I eat plenty of other things, but they are the best).
The other thing I do is make a deliberate and conscious effort to drink totally excessive amounts of fluids. Having done that, I drink some more. And not just while riding either. Hydrating before and after the ride is the key to avoiding dehydration, which is not to understate the importance of drinking during the ride.
Remember, it's never too hot to ride, but it is possible to be too unprepared.
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I am clinically insane. I am proud of it.
That is all.