The TRADITION soups that all the kids eat would there be a problem of LOSH when you add hot water ? Not discussing Bishel .
Before getting to losh it should be stated that adding hot water to the soup can have a serious bishul issue, because the spices, etc. are not precooked. Regarding losh, I am not familiar with the different types of soups, but here is the general rule. If the noodles, and solid pieces will stick together because of the water that is added to them, then it would be losh. However if the pieces are floating in the liquid of the soup then losh will not be an issue. Regarding the liquid of the soup, even if the powder will make it slightly thicker, if it is a thin liquid like chocolate milk, it is not considered losh, however if it becomes like a batter then it would be losh.