This is going to be the most boring recipe you'll ever read.
But it's also one of the easiest.
And it'll produce AWESOME flavor-juice. And it's made from stuff you usually throw away. So why wouldn't you want to do this?!?
1 Chicken carcass, parts, stuff [I use a leftover carcass after roasting and eating a chicken]
Roughly 1.5L / 1.5 quarts Water
Put all chicken things into the base of a pressure cooker.
Seal pressure cooker and cook for 2 hours.
Let the pressure cooker come back to room temperature.
Strain solids, reserving liquid. It'll keep in the fridge for a week or in the freezer until you move.