Our temperatures don't get that hot but during the summer months in Atlanta, I carry two Polar water bottles with ice and water in one and ice and PowerAde or Gator Ade in the other - if I'm riding 25 miles or less and I know I'll have a place along the way to refill the bottles with water.
If there's no place to refill the bottles or if the distance is longer, I'll fill my 70oz CamelBak with 1/2 ice cubes and then fill with water. I'll still carry one bottle with PowerAde or GatorAde.
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The Lord is merciful and gracious, slow to anger and abounding in steadfast love. - Psalm 103:8
I am a cyclist. I am not the fastest or the fittest. But I will get to where I'm going with a smile on my face.