I put cuttings in a zip-lock bag and just "wash" them with fresh water each day. If you miss a day or two it doesn't seem to matter. Out in good light but not direct sunlight. They soon produce roots along the cuttings. When the roots get reasonably long I put them on a pot of soil (suitable for the particular species) and then cover that with a plastic bag to keep in humidity.
I've done that sucessfully with wild species as well as with cultivated ones.
