I bought little squeeze containers (very much like these) for my bento, but I can't seem to get them filled without spilling/wasting a whole lot of sauce. Please tell me the secret! My soba is so dry. :(
Pour some soy sauce into a small bowl, squeeze the squeeze container with your fingers first and put the container's mouth into the soy sauce. Slowly loosen your grip on the container, at which point the soy sauce will get sucked into the container.