EFFORT said:
Like Kerpal said that's not going to do anything.
Your body naturally wants to be 6'2 @ 153lbs. To change that you have to do something extremely "unnatural" in the eyes of your body. Doing squats with water bottles, some body weight dips, sprints, pull ups, chin ups and push ups isn't going to be enough stimulus to add 20lbs of muscle to your frame.
You'll most likely just end up a little heavier with a belly and very little muscle gain from that plan. If I was you I'd just enjoy my trip and not bother trying to pursue this goal until I have the proper equipment, time, mental focus and budget. You can still participate in fitness, I'd do fun stuff like play sports, sprint, hike, rock climb etc.
Don't mean to sound negative here, just seen a lot of guys waste time spinning there wheels and missing out on fun things in life for a goal that was doomed from the start. Your trip sounds really fun, make the most of that experience, don't ruin it chugging down milk and food.
Yeah, the thing is I'm going to be there for like 3 months. A small investment every morning won't be a huge deal to me. Also, I've been pretty successful at putting on a few pounds of muscle in the past by doing body weight exercises and eating more. The only problem was I couldn't keep up eating so much and also got lazy with exercising, plus if I'm adding over 30 lbs of weight in a backpack I'm thinking I'll only be able to do 5-6 reps of pullups which I think is pretty decent intensity. Pushups I'll probably be able to do about 10-15 with the added weight, but if its not intense enough I can try clapping pushups or diamond ones or something. Same goes for the other exercises. I think it will all be intense enough to put on muscle for the first month or so, but if it gets too easy, I'll go out and buy some heavy dumbbells. My goal is something like brad pitt in troy. It wouldn't feel right for me to be any bulkier than that, plus it would be hard to maintain since I'm naturally slim.
I'm going to give it a shot as I don't have much to lose, and I'll keep you guys updated with pics on how it goes. I'll be the first to admit you were right if I end up becoming a 200 pound fat boy with no muscle in a few months
Here's a couple of pics of my natural and current body shape. It's from a year ago, but I pretty much look the same now, maybe 5 pounds of fat and muscle heavier.
http://img69.imageshack.us/img69/5166/n50837139016584463308.jpg
http://img838.imageshack.us/img838/7089/39904417369086844709041.jpg