Agua de Jamaica (Hibiscus Water)
Hibiscus dried petals shouldn't be very hard to find. Check your local ethnic stores, I have heard its also called Sorrel in some carribean stores.
As far as taste, I would say it most resembles cranberry but in my opinion so much better.
Can be served hot or cold and is a good alternative for Iced tea. It is also a mild diuretic so if you retain fluids this is especially good for you.