I feel your pain! The fuel belts are helpful. I have one that holds four 8 ounce bottles. But that's only 2 lbs. of fluid, and I have found that my fluid loss can be as much as 1 pound per mile during the worst of the Summer (but I'm a ridiculously heavy sweater). I've never made it past 11-12 miles during the Summer with my fuel belt, which is why the only marathons I have run took place in December, February, and April.
I know some people plan their routes as multiple loops that pass by their house so they can stop fairly frequently and guzzle water, Gatorade, etc.
If you live in a hilly area, running a route with lots of challenging hills can give you the same bang for fewer miles. Of course, it's also harder... so you sweat more... so....
The good news is that acclimating to Summer heat and humidity really pays off when it's cool. 18 miles in October when the humidity has dropped a lot and temps have dropped back a little bit will seem like a piece of cake compared to 11 or 12 in the August sauna.
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