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.