I like herbal teas. Just drinking anything hot seems to calm me down sometimes, but some of my favorite teas are:
-Traditional Medicinals lavender chamomile tea (Just a warning to be careful with other teas of this brand; some of the herbs can trigger mania in some people, and even if they don't, some herbs don't mix well with bipolar meds.)
-just plain chamomile tea
-peppermint or spearmint tea
-SleepyTime original, vanilla, or peach
-green tea (decaf for me, since I'm really sensitive to caffeine)

I also use yoga and journaling.