What sort of temperatures can a fog machine reach?
If traditional fog machines run too hot, can anyone suggest anything cooler? (and I'm NOT going the Dry Ice route!)

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If you want mist that 'drops' when it exits the tube, you have to actively chill it below ambient temperature with ice or a refrigerator unit.
To carry it on your person you need a hefty power source to a) heat the fog machine and b)subsequently chill the fog...
Reccommend: Get a stationary fog machine -- build a fog chiller (search it) -- and PIPE the fog to your costume while in range of the machine.
You'd need more power than I think practical.
L