I think it‘s worth to think about another bottle.

As known I was in old MINIS. There are cheap (British) bottles around with the pump outside. They pull
the water via a tube.

Have a look here: (and there are grommets)

http://www.minispares.com/search/classic/washer%20bottle.aspx

René


2018 plus4 (sports green)
with a homemade really shiny red tinted dash…