its gonna be pretty hard to develop any real size without access to any gym equipment...that doesnt mean you shouldnt make the most of your situation, do all the bodyweight stuff you can for now, squats (single legs, sissy, etc), plyos, step ups, pushups, pullups, dips, handstand pushups against the wall, and whatever variations of those you can do...until your situation changes
and seriously, look around you, there's gotta be something around you that weighs at least 40-50lbs that you can improvise with and just build from there...its pretty easy to make a 40lb sandbag you can do squats with on your shoulder or in a front squat position