In a medium saucepan, combine the water, hibiscus flowers and sugar over medium-high heat.
Bring the mixture to a boil, stirring occasionally, until the sugar has dissolved.
Allow the mixture to cool for 25 minutes.
Add the lemon juice, lime juice and vodka.
Place the ice in a tall pitcher.
Strain the hibiscus tea into the pitcher and discard the flowers.
Refrigerate until ready to use.
*Can be found at specialty Latin markets