Bottle 2
was the first puzzle of this kind I bought. The wooden ball is supposed to come out. I still have no clue what the idea is, but I have to admit, I did not yet spend more than 2 minutes on it...

Bottle 3
is supposed to be more difficult than number 2. The same story holds though: I didn't try it yet. The idea is to get the cross out of the bottle (presumably with the chop sticks).