Yes. In soup it should make no difference what kind of salt you use, since it all dissolves anyway. But because table salt is finer, you get more of it in a given volume, so you have to reduce the quantity a bit. If you're not comfortable doing that, then stick to kosher salt, or some similar coarse-grained salt.
Kosher soup is any soup that is made following the laws of kashrut (Jewish dietary laws). It is not a specific type of soup.
Well chicken noodle soup is ok fo dog once in a while but since it has a high amount of salt is might want to add at least half a cup of water along with the soup to reduce the amount of salt.
The general meaning for kosher is "clean/fit or proper" and if you relate this to the cabbage soup diet, yes it is kosher and can help you stay healthy.
You can use oregano or thyme as a substitute for marjoram in soup.
Those Jews who like chicken soup eat chicken soup. Religiously observant Jews would require that the chicken soup be kosher.
That depends on the company that makes it.
No, it's parve.
Only if kosher ingredients are used, including the chicken parts, and cooked in and with a pot and utensils only used for kosher meat cooking.
Menudo is made with Tripe. Tripe is a part of the digestive tract, usually of cows or sometimes of swine. That makes it OFFAL (animal guts). If you were able to find kosher cow tripe, you could make kosher menudo. (There is no issue with offal so long as it comes from a kosher animal). I have personally found my own "Menudo Curry" to be extremely cheap to make and even more rewarding to eat. Just don't forget the Coriander! (Do not share with the unappreciative, more for us!)
soup (chicken, lamb, beef, vegetable), salad,
When you mix distilled water with salt and soup, the result is dilute soup.
salt content in batchelors cup a soup