Ok, I'll thank you, even though I was already going to use proper apple juice.
In return, I will suggest you give it a dusting of freshly ground cinnamon. You will either thank me later, or curse me for committing sacrilege against your Polish traditions, in which case I'm sorry...

Certainly. But it's much easier to measure out the right amount in liquid form.
I bought a dripper bottle from a health store. 20g salt, 80g water. Very easy, very cheap.

I found it improved drastically after adding a few drops of saline solution.

What a horrible experience. The egg mixture coagulated, making the "frothy head" taste like spiced wet scambled eggs, followed by hot watered down cognac.
I must have done something horribly wrong. Otherwise people wouldn't have enjoyed this cocktail since before 1862.