Substitutes include saline solution, distilled water, and salt water. Store your contact lenses in saline solution as usual. The safest option is saline solution, however you should only use it when absolutely necessary. If you use other solutions instead, be sure to thoroughly wash your hands after handling them. If you are using salt water instead of solution, be sure to use only purified water and salt of the appropriate concentration. Do not use tap water or ocean water because they may contain substances that are harmful to your contacts. It is important to always follow proper hygiene procedures when wearing contacts. Sooner or later, you will need to clean your lenses, and it's best to do so following these instructions.