To promptly wet fingers slightly at anytime every day at distributing sheets of questions in an examination room, at counting paper money on a visit by a money collector, at turning the pages of a book at a library by a reader or the like under a condition for enhancing working efficiency and sanitary effects (or without employing saliva).

As a result, a 'portable water container' is contrived or a water container 3 is connected to a wrist-watch type band 5. The container is installed on a wrist and can be opened and closed by one touch with a hand by operating the knob 1 of a lid 2. Water is retained with a sponge 4 contained in the container 3. A finger is wetted with the water of the sponge. As the container is tightly closed by the lid 2 when not in use, the leakage and evaporation of the water can be prevented from occurring.