I am deploying this summer to afghanistan, im in the marines, I will be having alot of time on my hands and will try to gain some muscle/mass.

my weight is 185lbs
height is 6'2'' with very low body fat

my meals will most likely be limited to stripped usmc M.R.E.s and maybe some nuts/friuts here and there but those arnt very available.
I wont be going on many patrols so besides high endurance workouts I wont be burned too many calories in the heat. I am however on a budget and need some supplement advice, I dont want to go with all the crap you see in adds, just cheap supplements that work. keep in mind il be in a different country so some things you can think of that arnt completely legal here I could get sent to afghanistan. within reason.