When i didn't have money for supps, i used to drink 1 liter of milk post workout. I also had 1 liter with breakfast.
Since milk is cheap, has protein, carbs and calories it made me grow really well. Following this 'diet' i got up to my heaviest weight ever (117,4kg).
Today,i don't dirjnk as much milk as i used to, but still think its a great way to build muscle for its convienence and price.
I'd say go ahead.
Peace
D