I don't think there's any harm in drinking coffee on a daily basis. Even red wine in moderation can have benefits, so I'm sure coffee is even less harmful in moderation too.
I'm not a huge fan of coffee, but occasionally if I'm out (and possibly desperate for caffeine), I will get a skinny latte from Starbucks. My boyfriend also has this neat little press that mimics a French press in the mechanics, but only makes a single serving at time and costs about 20 bucks from Amazon. With the beans he gets from the local coffee shop, it makes the smoothest cup of joe I've ever had - absolutely no bitter aftertaste whatsoever. It's fabulous iced with a little half & half and some Torani Hazelnut syrup!
Primarily however, I drink loose leaf tea from adagio.com -- it's my absolute favorite site for tea! My favorites are their Irish Breakfast, chestnut and rooibos vanilla
I can drink anywhere from 20 oz to 60 oz of brewed loose leaf tea on any given day in the winter. In the summer it will most likely only be in the morning.
The Irish Breakfast is like a kick in the pants in the morning with a little half & half and sugar. Blows coffee out of the water IMO! I brought a bag of it along with some paper tea filters from adagio to work... can't start the day without it.
I also drink a lot of Diet Raspberry Snapple and various flavors of Crystal Lite all year round. I try to drink plain water, but it makes me feel bloated/uncomfortable