Well, for the sake of safety, I will suggest you to buy the solution as soon as possible. As we know that solution is a kind of fluid which is designed specially for contact lenses' cleaning. So if you do not use them to clean your contact lenses, it can be very dangerous to make your eyes infected. But for some cases, you can just mix some pure water with the salt, to make them become salty water. In that way, it can work as solution to be used in cleaning. But you should wash your hands cleanly, so that it can not infect your contact lenses. But you still need buy solution from the glasses stores.