In that case, it sounds like my power supply issues are easy. Most of my effects are in the Quattro and that runs direct from the mains. Other than that, I'm only using the Wah and a Pitchblack. I was going to just use a daisy chain at first but they all connect 5 or 6 pedals, which seems a bit excessive when I only use two. As a result, I was thinking of just running the wah from its own power supply and leaving the tuner on a battery for the time being. If I get a noise gate too at some point, I can always add a daisy chain extension to any power supply I buy. Anyway, it seems likely that something of 500MA will easily power even 3 effects.
The current draw really depends on the circuit, can range from less than 10mA (simple fuzz circuit) to 200+mA (digital delay / modulation). You'll find a lot of useful infos here :
http://stinkfoot.se/power-listAbout the power supply unit itself: it has to be at least very well filtered to avoid ripple noise, which rules out most standard adaptors. I've AB tested the boss PSA 230 and the cheaper Thomann equivalent and the difference was huge.
wrt/ daisy chain, the boss PSA (500mA) can technically provide enough current for a basic pedalboard (ie: a tuner, a couple dirtboxes, a wah, an analog modulation and a small analog delay) but you rapidly have issues with bad grounding, hum, weird noises etc.
Now if it's only for a pitchblack and a wah there shouldn't be any problem (and that's an understatement). Also the pitchblack has a power outlet that can supply up to 200mA (if it's own power supply can provide that much current itself, of course). Note that your wah itself shouldn't need more than 20mA (the Bad Horsier is stated at 12mA, the PWA I & II about 5mA, and most wahs - Vox, Cry Baby etc - eats even less current, sometimes under 1mA). The pitchblack itself will eat much more current.