In reply to galpinos:
I regularly use recycled plastic containers for all sorts of things.
My FAK is in a HDPE/PP square-ish tub that had skimmed milk powder in it; many of my kitchen 'dry goods' are in the bigger versions. I carry oil & balsamic vinegar, etc in little 60ml 'energy shot' bottles I have found discarded. I spotted a nice aluminium screw- cap tin containing lip balm today, for £1.25.
But for your drugs, I'd probably use a fizzy electrolyte tablet container.