You should just regard it as the contact lenses. If you do not wear it, you should put it in the solution. If the days are long, you should remember to change the solution often to keep the clear symptom of the contact lenses. In addition, you should remember not to wear the colored contact lenses for more than eight hours a day which will be bad for your eyes.
Generally speaking, it's not a complicated thing to take care of colored contacts. The most essential point to allow contact lenses last for a long time is to keep them clean and moist, so are the colored contact lenses. You said you just wearing for fun and do not wear daily though, you still need to clean them at least one time per day. Just use contact lenses solution to clean them. And then keep it properly in contact lenses box with solution to keep moist. In addition, once you wear your colored contact lenses, wash your hands with warm water and soap, then dry your hands with a clean towel before touching them.
You should use a proper contact lenses solution to clean your colored lenses and store them. The best solution is a no-rub multipurpose solution, which can not only disinfect your colored lenses and remove protein build-ups but also help you avoid rubbing your colored contact lenses when you clean them, such as Opti-Free Express No-Rub. If you use a solution without the no-rub feature, it is likely to scratch the color in the process of cleaning. Soak your lenses in enzymatic cleaner once a month, which will keep the color vivid and bright for longer time. Store your colored contacts in a lens case with screw-on lids so that the solution necessary to keep the lenses moist and flexible would not leak. Remember that contact lens solution is only good for six months once opened. And do not clean your colored contact lenses with water because it is full of bacteria and unable to clean them.