A one spot will work with the '69 and the Soulbender but you would not be able to use other pedals in the same chain because of polarity issues. Other Fulltones are the *usual* polarity (not sure about the Octafuzz though).
To get 18V for the pedals use a Godlyke Power Pump, but the CLYDE pedals I believe will not run on more than 9 volts! As to current, you can run multiple pedals on the typcial 200ma power supply. It's the chorus, flanger, delays that use more current. The Fulldrive is like 13mA, the OCD is about 10mA the Fat Boost is somewhere around 10mA, so that adds up to about 33mA, but remember that if you double the voltage, you cut the current demand in half, so those three pedals can run on 16.5mA at 18 volts.
...and a OneSpot with a daisy chain and a Godlyke Power Pump will let you power a Clyde (or any other pedal(s) that need 9V) with 9V and a Fulldrive (or any other pedal(s) that can handle 18V) with 18V, all at the same time.