Could i drink water and not soda?

I know some body that drinks alot of water a day he's 14 like me nad he's skinny like me but hes not active all he does is drink at least 2 gallons of water a day and sit at his computer playing games and  he eats .

Could i do what he is doing and not get chubby

Like: i still eat but drink alot of water and play online games because i kinda miss that without getting the stomach?

I was there before and i never want to be fat again

we both are skinny

im 118 pounds 5'9 and he's 5'8 110.

soda has calories, water doesn't. if you cut out soda and start drinking water, you will probably lose weight.

First of all; world of warcraft. I just wanted to say that.  SECOND remember that everyone's metabolism works differently. and also there is such a thing as 'skinny obese'. It refers to a person whose body fat level puts them in the 'obese' category even though they look skinny.   Activity is  always important.