- Get a plastic container.
- put sand or soil or whatever you can find that can be used as "substrate". Anywhere from 0.5 to 1" thick should be enough.
- Put enough water to cover substrate.
- Lay HC on top of substrate.
- Cover plastic container with clear plastic wrap (saran wrap?).
- Put container somewhere where it gets some sun. (A desk lamp would also work, LOL)
- Check on the HC everyday, spray some water on them if needed.