I live in San Jose, California and it can be hot here, but even if I was running someplace cooler 12 miles with no liquids would leave me with energy troubles. Of course, it depends on how fast you're running, and lets just say that it is gonna take me awhile to run 12 miles.

I'm going to start by taking frequent small sips of water. I'll try one every 15or 20 minutes.

I've read that after an hour and a half of running, you should start taking in some calories, and with my biking I have found that this is true for me. So, I'm also going to try "sipping" a hammergel on my 8 mile run this weekend. I think I could divide that into 3-4 sips.

I'll let you all know how it goes and thanks for the suggestions! I appreciate them all!