Im roughly 15 - 20 lbs underweight for the army. how can i gain weight fast?

Question

DONT GIVE ME A DUMB ANSWER LIKE "JUST EAT FOODS THAT ARE HIGH IN FAT". DUH THATS JUST COMMON SENSE. AND IVE TRIED LITERALLY EVERYTHING. IVE TRIED PROTEIN DRINKS,BEING LAZY,BEING LAZY AND EATING ALL DAY. AND I JUST CANT GAIN WEIGHT!!!! SO PLEASE TELL ME,HOW CAN I DO THIS?

Answer 1

work out alot  and drink milk and yogurt  muscels are alot of weight   eating and then being lazy will just make u gain fat  and gaining muscles is better than gaining fat

Answer 2

creatine will help you put on an easy 5+ lbs of water weight in a week or so.