I have been in some situation like this:
1. In a boat over the waters.
2. Two hands filled with items.
3. Empty bucket in the pack.
4. Grabbing the bucket on cursor.
5. Filled the bucket from the waters.
6. Cannot move without dropping buckets.
7. Cannot put full bucket back in pack.
8. Cannot put bucket in full hands.
9. I must lose my bucket to the waters.
I think clicking an item on the hands should do a swap of equipment, or maybe I can empty my bucket from the cursor.