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 <code>unflavoured whey protein</code>, but the

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.