Have you tried a doidy cup? (available on ebay/from NCT) . They are slanted cups and barely need any tilting to drink from, the baby can also see the liquid coming towards them so barely any is spilt. The easiest way to start with them is to have your baby sitting on your lap facing away. I first got into them when I saw F was drinking his bath water! He sort of laps at the cup like a little kitten. I think it's great when a baby can go on to use any cup and it encourages them not to wander round with a spout in their mouth.