Absolutely. There are plenty of known benefits to certain teas and it's a fun beverage to explore. A nice cup of hot tea is also satiating and can take the edge off when you're starting to feel hungry. Ensure you read the nutrition facts before purchasing a product. If you have any douts, speak with your coach.
If you're using black or green tea - that is, if you're using a caffeinated form of tea - then, be sure to offset the diuretic effect of the tea by drinking an equivalent amount of water. That's in addition to the daily minimum of 64 ounces of water.