In general, when you cook Qaldusoups, you use 300mL (1 glass) of water for a single pack of Qaldu Soup Concentrate.
But in kitchen, sometimes the flame is too big hence the water evaporate, or in other case you need more time to cook the vegetable (like carrot which sometimes need more cooking time), this is also will cause more water evaporate
No worries, just taste the soup at the end of your cooking time, if it tastes too salty then you can add more water