I saw a dad showering a kid from a drinking bottle. It did not look so practical. So i made a shower head to any standard plastic bottle! It works nicely.
There are two versions of the cap: a high flow version (with bigger dome) and a low flow version. The low flow one gives a much lower flow. This means that after swimming in the sea a short haired person can shower off the seawater with 0,5l water!
This low flow cap is named "3Dan_soda_waterer_small_flow.stl"
The low flow version has also a V-shaped bottle contact surface which functions as a seal. A little bit of water is still leaking from the threads but I do not see it as a problem.
Please see an awesomeGIF animation of the product in use!
Printed with FlashForge Creator Pro. 0,2mm layer hight is good enough.
Please use at least 20% infill (I used 20%). When tightening the cap on the bottle, it is a great force that loves to tear layers from each other. So a little bit more infill is welcome.