Since your question was answered already OP, could you anser a quick onr got mre. Where do you train the reusable medpacs, and did you get alien blood from diplomacy?
The reusable (and blue) schematics are obtained through reverse engineering. Took me maybe 5-10 to get the blue...and probably 10-15 to get the purple from reverse engineering the blue one.
Alien Blood is from diplomacy but its a rare item so it might have taken me 10-20 missions to get what I needed. (Can't remember exactly....only I was annoyed at how long it was taking).