Can taking a big cup of milk and 15 grams of glutamine in a milkshake help me increase muscle size?

im not going to buy protein powders this summer til i go back to school..... so any suggestion on how to increase muscle size besides exercise like food or something else i mean dont get me wrong im still gonna exercise but anymore things i should eat or do???? thankzz im already 5'8 and weight 150 pounds all i need is to gain muscle im already skinny i just wanna add muscle size