Look for an all natural brand which has not been cut with other sweeteners. One of the most common mistakes people make when using stevia is adding too much. For a cup of tea a light dusting will do. Stevia does not taste like sugar, it is just super sweet - up to 30 times as sweet. It works well in baked recipes. For example, if a batch of cookies calls for 1 cup of sugar, reduce the sugar in half and add about 1/4 tsp. of powdered stevia extract with little or no compromise in sweetness.
Lemonade? Sweeten it with stevia instead of sugar.
For the students at MIT who prefer a non-dairy ice cream I created a vegan Coconut Oreo Ice Cream.
I added the ingredients to a large mixing bowl and placed it in the walk-in freezer. Then about every 15-30 minutes I gave it a stir (I needed to use the electric mixer the last couple of mixes). After about 5 hours it was all done. It only has four ingredients- coconut milk, sugar, vanilla, and Oreos. Add the Oreos after the ice cream has frozen. See recipe on recipe tab.