How to gain mass?

Question

I have to gain about 20 lbs to join the air force and I've got two months to do it. I have very high metabolism and don't gain upper body strength easily.  SO I need advice, ladies:
-best foods for gaining mass (fast food and ice cream don't help)
-best exercises to gain muscle- my goal would be more mass around my thighs and core, that's where I gain most easily
- other tips to help gain
I'm drinking water to stay hydrated but I know that can also help you lose weight. Anyone know good hydrating drinks that can help gain or have other tips to gain fast?
I know it's not really healthy to put your body  through drastic change like this but I'm not in the best domestic situation so the sooner I can join the better. All help is welcome!

Note: I have extremely limited funds.

Answer

Protein bars and shakes.

Answer

Buy a protein powder and make your own shakes with peanut butter and banana and frozen fruit (like blueberries). If you can afford another protein, get casein too. It takes longer for your body to break down so its like a slower release protein. Great for taking before bed so youre not waking up with a super empty stomach. Just mix it in some water and chug it before bed. For legs, do a lot of squats, like learn how to use a squat rack, front and back squats. Those kinds of squats do more for you than regular squats. If you cant do a squat rack, do squats with heavy weights. Get a heavy weight and hold it at your chest. Always try to maintain good posture and proper stance. Look up stuff on youtube. I heard good thing about the womens athlean x channel.

Answer

Eat a ton of protein! Red meats especially. Steaaaakkk! Gah, I'm jealous. And also go to the the gym and lift heavy (not so much to hurt yourself). Heavy weights, low reps. I recommend squats and the quad machine. I'd work your upper body too because you will get a little. I gained like 10 lbs of muscle in 1 month and that was with eating super clean. If you try the bulking route- which is to eat dirty and lift a lot, then you can gain pretty quick. Just no cardio...

Answer

Foods with protein are going to help and especially if you're eating them with carbs.

Answer

Start doing weighted exercises at the gym to gain muscle

How to gain mass?

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