How daisy chain works on pedals?

I'm a little bit confused about that daisy-chain. So, here's my case for example. I have two pedals, a Boss DS-2 Turbo Distortion, a Boss BF-3 Flanger and a Boss PSA-230S AC Adaptor. Now, the Boss PSA-230S, obviously, can only power one pedal without the daisy-chain, right? What I want to know is, how to power up two pedals using the daisy-chain. I just don't f*cking get it, I'll plug the Boss PSA-230S to the DS-2, for example, how could I power up the second pedal? I've seen on some pictures that daisy chains are just a couple of cords, and it can't connect to the wall. Other diagrams I've seen involves a pedal with an input and output plug for the daisy chain/adaptor like the Boss Chromatic Tuner, but I don't want to buy that kind of stuff just to power up two pedals, I just want to power up the DS-2 and BF-3 with an AC Adaptor, Patch Cables (if it counts) and daisy chain. Please someone explain it clearly to me.