Add the hibiscus to the mason jar or pitcher. Pour the cool water over the dried flowers and screw on the lid. Shake to combine. (If using a pitcher, stir to combine.)
Place a fine mesh sieve over a pitcher and pour the tea through the sieve to capture the hibiscus flowers. Discard the flowers.
Sweeten the hibiscus tea to your tastes with the simple syrup.
FOR THE SIMPLE SYRUP
Combine the water and sweetner in a small saucepan over medium high heat. Heat, stirring constantly, until the sweetner is completely dissolved in the water. Remove from the heat and cool to room temperature. Store in an airtight jar at room temperature or refrigerated.