A rain barrel gathers what falls from the sky for later use. It is read as foresight and the wisdom of storing up resources, patience or feelings for when they are needed.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.