The hot water bottle is read as simple, homely comfort on a cold night. It often points to a need for tenderness or to memories of being cared for.
When this appeared in your dream, what were you feeling?
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.