Rose ,
I have grown and used stevia for several years . If you are using it in loose tea just add a couple crushed leaves.
If you use it in other drinks It can be steeped in water like you would tea but longer 30 minuets or so then use it like a simple syrup adding to say; lemonade till you get the taste you want . To keep the liquid form I freeze them in ice cube trays then bag up for later use . I even use the ice cubes in tea when I'm impatient and do not want to wait for it to cool down.