Always loved these glue pistols!
For those who don't have, buy a balloon
View attachment 34617For bottles fitting +- the size of your hose: rolled up balloon 'mouth' functions as rubber joint, on the other side cut a hole at the end and fold over the tube; cut a whole in the screw cap, put the hose from inside then screw the cap back at the bottle. Condoms might do the trick as well
If bottle is much bigger, simply cut a disc of duct tape, stick it in the inside of the screwcap, cut it radial, then fix it to the inside of the hose.
Or just buy one of these great glue pistols and just glue cap and hose together (most bottles have identical diameter lids). Enjoy!