B.B.
With both our daughters, they used sippy cups during the day well before 18 months and beyond. BUT they wanted that bottle at night before bed, and sometimes if they woke up between 18-24 months. We figured if it was once maybe twice a night, we were't really worried. Now we would OFFER a sippy cup, or an 8 oz. bottle of water with a straw, but they usually wanted the bottle.
It could be he's going through a growth spurt too. WHen he wakes up and wants a bottle, put some cereal in it and see what happens...if it helps him sleep better.
With the sleeping in your bed - pick your battles. Sometimes you can let him come into your bed, let him fall asleep, then go put him back in his bed - and that can work better than actually getting up and comforting him. Supernanny even says that once in a while it's okay.
Let him have a buddy too - that might help comfort him if he wakes up if he has a buddy. (stuffed animal/teddy bear).
Just a few thoughts, for what it's worth - and good luck!