Some of my friends wear a hydration camel pack, I have one, I hate it. Others who are less concerned about etiquette drink from random garden hoses.
I can't run at the moment, but when I was, if it was less than two hours I would just rehydrate at the end, or plan a circuit to lap back to my make shift drink station.
I hate carrying anything when I run. But the belt looks like a better scenario. If I get the chance again, I will give it a shot.
Over 35 degrees Celsius I would hit the treadmill in the AC at the gym.