I was in a situation where all my classmates in college had a dinner together which our school prepared for us on our first day of school. There were some cans of beverages on the other side and someone told us we can have them without charge. And some of us didn't hear that, so i said to them "You guys can grab some beverages over there." Now i'm wondering grab as in 'grab food' can mean getting food free of charge as well since I've always heard people say things like "Let's grab some coffee" meaning "buy" some coffee.. Does what i said to them sound natural? Or would there have been better ways to say that?