Empty the larger can of its water and allow it to air out. In one week check to see if the photograph is relaxed enough to store flat in an acid-free container on a shelf. You may need more blotting time depending on the photograph. There are a number of ways to store images. There are different costs associated with each method.
Alternatives are available but mylar is more readily available.
This is the best way to store negatives. Polyvinylchloride is the base element of most photographic sleeves commonly found in department and discount stores. These sleeves are chemically unstable. The polyvinylchloride eventually deteriorates which becomes highly acidic and will quickly destroy any image it touches. Paper envelopes are a cheaper alternative to plastic sleeves.