1.

Add some CMC to the light blue flower paste/sugarpaste mix. Keep on adding the CMC until you feel that the paste is a bit thicker (you want the bottle to hold the shape/not sink, but at the same time you want to be able to easily form the shape without cracks forming). Roll an elongated, oval ball.

2.

Start gently pressing, in about 1/4 of the length of the oval ball, to create a narrowing. Keep on pressing the paste and rotating the element. Work gradually until you get a similar shape as the one in the photo.

3.

Flatten the bottle.