Water for "casual" drinking. I add lemon juice to tap water, filtered or not. I still keep bottled water on hand; cheaper than stopping somewhere when we're on the go or need something on the way out the door. Also great for soccer season. I usually keep a couple extras on hand, too, for kids who forget their waters.
Milk for mornings -- usually on cereal.
DD gets a juice box or pouch at lunch time.
Once a week, sometimes
twice, I get a diet coke from the pop machine (not having a case around
actually saves me from myself).
Lightly sweetened tea OR the arizona
green tea mix -- one of them is always on hand; in the summer we have
tea in the fridge all the time.
DH has really cut back on his
gatorade/soda drinking. I used to spend $15 or $20 a week just on
drinks, but now that's what I spend for the whole month most of the time
-- HUGE improvement.
I always keep cranberry juice on hand for medicinal reasons. If I get even an inkling of a bladder infection, I drink two glasses straight away along with lots of water. I'll then drink a glass every day for a week. Even if I purchased the brand name, not-on-sale brand, it's cheaper than a trip to the doctor, that's for sure!