Re: longer than stuff lasts in a frige
I've used the bug sprayer shower on previous boats but never found the pressure particularly acceptable. On our old girl with no pressure or hot water we went one step further and got hold of one of those el cheapo 12v showers. In warm weather we'd heat water with a solar bag, in cold a kettle. Into head sink or bucket, add cold to taste then throw in the 12v pump. Worked splendidly and didn't seem to use much more water than the bug sprayer.
(My bug sprayer was the plastic type. Whether or not the stainless versions work better I cannot say)
“Give a man a fire and he's warm for a day, but set fire to him and he's warm for the rest of his life.” Terry Pratchett