Well, as the name whey suggests, you could maybe go to your local farmer and get some fresh whey.
If this does not suit you, you could try to get some natural whey powder. I do not mean the unflavoured whey protein, but the really natural whey.
If you still do not want the powder, you could simply drink milk. It also has a decent amount of whey protein by nature....
There does not seem to be a real alternative besides that. I dug through some posts on the internet now and some suggest egg whites, but I think the best would be a whey shake.
The benefit of a shake in general is the better and faster digestability, so maybe you should really consider it.