Nearly half of the U.S. population drinks tea daily. On Jan. 23, a chilly Saturday morning during National Hot Tea Month, the door swings open at Serendipity, 712 Wollard Blvd., Richmond. To the left is a chalkboard in three pieces that in size and shape resembles an Asian room divider. Each board boasts some of the many drinks available. In addition to a variety of hot and cold coffee blends and hot chocolate, there are teas. N Between tables, straight across the tile floor from the glass door, stands Kathy Fitzwater. She and daughter Maranda Oster co-own Serendipity. Fitzwater takes an order. Milk within the espresso machine whirs, frothing milk to blend with black tea to create chai latte. During the process, she talks about her best-selling teas. “The best tea is probably the chai tea, or the 100-year, which is a black tea,” she says, and names some of the other teas in stock. “I have a berry rooibos, I have tree jasmine, we have green tea, I have a blue butterfly, I have an…