Originally Posted by E-Mursed
Put your carboy in a bucket with water and a damp T-shirt over it that will create an evaporation cooling effect.
While that will help, depending on ambient temps it may not be enough. I have an IPA in a bucket of water with a damp t-shirt draped over it. Once outside temps hit 90 that wasn't enough to keep it in the 64 degree range for fermentation so I started having to rotate ice bottles and use a fan to force evaporative cooling. Neither one of those are conducive to traveling.
I'd put it in a basement (or a friends if I didn't have one) or wait till after I traveled to brew.