Simple rocket designed to fit a 2 litre pop bottle

turn the bottle cap facing down glue the fins to the ring so the bottle can stand upside down
(cap at the bottom)you with need a cork to fit in place of the cap and a length of plastic tubing
approx. 8-10 millimetres (not precise) drill a suitable hole through the cork for the tube to fit in, connect the pipe to a suitable pump most airbed/bicycle pumps will suffice, (i actually use a compressor)when your happy with your results, fill the pop bottle around half full of water ,
and start pumping (stand well back as you may get wet) expected Hight attainable around 50ft, try it without the cone first, the cone is merely there for decoration,

Avoid areas with glass as it could well hit windows ect,

have fun

just added an stl file showing the setup there is a blend file also to further explain how its assembled added a bung with 8mm tube for connecting,
the more pressure you can build up in the bottle the higher it will go

If you can use flexible resin for the tip it would be better,

quick note there is no drain hole in the tip so will need to be released from the print plate over the resin bath as it will be full of resin.

(its not necessary to print anything off, the bottle will fly on its own with a suitable makeshift stand)
all you need is
a pop bottle, a cork to fit a length of flexible pipe around 8mm a bicycle pump with a suitable adapter that will fit in the pipe and of course a quantity of water,