I have made a parametric nose cone generator in openscad to be used in conjunction with Slic3r spiral vase mode for thin walls and light weight. This is a Bi-conic design and is meant to be permanent, it provides the (currently) lowest drag while being FDM printable. A flat base may need to be carefully removed depending on your print settings, and if you have measured properly it should just slide over and all you will need to do is duct tape or glue in place.

For more info on bi-conic nose cones. https://en.wikipedia.org/wiki/Nose_cone_design#Bi-conic

overhang =30;//to secure to bottle
bottleradius=60;
lowerconeheight=40;
sideanglelower=30;
sideanglehigher=45;


cylinder (overhang,r=bottleradius);
translate ([0,0,overhang]){
    cylinder (lowerconeheight,bottleradius,upperconeradius);
}
upperconeradius=bottleradius-(tan(sideanglelower)*lowerconeheight);
upperconeheight=tan(sideanglehigher)*upperconeradius;
translate ([0,0,overhang+lowerconeheight]){
    cylinder(upperconeheight,upperconeradius,0);
}