I have long hair (mid shoulder blade length), and live aboard full time, mostly at anchor.. And getting extra water is inconvenient. SO I have the same issue.
I have a solar shower that heats water if the weather is obliging enough (if not, then I boil some water in the kettle and mix a bucket with hot and cold to a bearable temperature.
I use either the solar shower, or my bucket of warm water to rinse my hair and wet it - making sure that the water I use falls into my bucket, so I can keep using the same water again and again until I feel my hair is wet enough. (I use a plastic drinking beaker that I use to scoop and pour)
I then soap up, and rinse my hair FIRST with the water from the bucket, this time letting it drain overboard or down the sink, and if more water is required, I use the water from the solar shower to finish off. I have a 5 gallon solar shower and can do 5 hair washes like this (skipping any conditioner phase).
If the sea water is warm and clean enough, then I take a swim, which acts gets the hair nice and wet - I then just use one beaker of water to rinse the salt water and find I can shampoo fine from that point forward.
Biggest water saving comes from the fact I probably only wash my hair every 3-5 days (depending on just how respectable I need to look or good I need to feel)
Also I keep a separate bucket to store rainwater (often recovered from inside the dinghy if we get enough rain, and the water I'm catching isn't salty), I then use that water to top up my solar shower.
I don't use any special brand of shampoo, just the cheapest I can find for the most part - but I do have it in a handy pump dispenser which somehow seems easier to manage. Ever so often I'll spoil myself and use conditioner, and this obviously takes a little more water (although you can always get the combined shampoo/conditioner if you feel regular conditioning is necessary).
My biggest issue with longer hair is not getting it clean, but finding the dry stuff all over the boat. For some reason it seems way worse than in a house, I find hair EVERYWHERE.. I've somehow conditioned my husband to agree it's not mine but "THAT WOMAN" (mystery woman) who is leaving hair all over the boat. I try to brush my hair out in the cockpit but still it finds its way everywhere.
Gemini 105Mc - Cruising
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