The runs and the heat

I fine myself in Los Angeles and just finished my first long runs (10 miles). After the marathon i have been keeping up with 5 miles twice a week. Today i ramped it up. Wrong city to choose - it was hot bu 7 am! I was carrying but one bottle of water. Just about enough because i conserved the amount i drank. It did feel good. I think i should start running at 5 am to avoid this next time.