Where does the world "spragniony" come from? It doesn't relate to Russian's "жаждущий", Czech's "žíznivý", or S/B/C/M's žedan (жедан) so I am a bit confused regarding the origin of it.
Well, "pragnąć" is "to desire", so I guess it's the most basic desire, to have water and live ;)
If I want to say it in the sense of "Are you (any of the following)...," I should use 'lub' instead of 'czy' right?
yes. Although I would use "albo" even though it would imply you an be only one of those.
Doesn't work as it gives you a choice between A and B. You can't be surprised when asking such a question ;)