At work, when I'm hungry, I sometimes resort to instant soup (Royco, in case it's relevant). Simple to make: heat water, put package content into cup, pour water into cup, stir.
However, I often find that the powdered soup has a bunch of wet powder residue left at the bottom of the cup after drinking. although this residue is full of taste, it means the rest of my soup was actually blander than it should be. I also usually have a small bit of residue on my spoon that I can't seem to fully dissolve into the rest of the soup. The residue on the bottom of the cup usually can be fixed through proper stirring, but the spoon residue is trickier.
How can I make the soup powder dissolve more effectively so all of the powder is part of the soup?