Lilah has used an old-fashioned free-flowing spout sippy for water independently since 9 months (we started to offer it at around 7-8 months), but when I introduced cow's milk at one year, she wouldn't take it from that type of cup. We then tried a straw cup and she guzzles it, especially if I let her take her cup outside with us to play-- she'll play a bit, then come back for her cup, walk around and drink, then leave the cup and play a bit more-- she ends up drinking a fair amout this way. We're still nursing first thing in the morning and right before bed. She has never taken a bottle, so all the rest of her fluid intake is from cups.