Water alone sometimes causes dryness, but it could also have a lot to do with the hardness of your water.
If this be the case, you might want to try chelating some of those minerals off your hair. You can do this with a chelating shampoo, but since you're WO (water only), you can try a citric acid rinse. You can do this with lemon juice mixed with water, or citric acid powder mixed with water.
What this will do is help to remove any mineral deposits off the hair shaft and rinse it away with the water. I suggest not letting the rinse sit in your hair or else it'll cause lightening.
Also, mineral oil helps to seal moisture to the hair shaft. I know some people are wary of mineral oil, but if it's used in small quantities, it's very beneficial. I've been using it only for two days, and I'm WO, and my hair is soft, shiny, and is like silk when I brush it with my boar bristle brush! I really like mineral oil, especially when I also have hard water that dries out my hair.
You can find mineral oil usually where the laxatives can be found in a drug store.
If you don't want to use it, there are other options. Honey moisturizes nicely, as does apple cider vinegar. You can also try other oils like extra virgin olive oil, jojoba, argan, etc. There's plenty to consider and explore.
But if you are in a colder climate, I personally would suggest you try out mineral oil first.
Here's an article about mineral oil and its benefits with hair:
http://forums.longhaircommunity.com/...&articleid=225
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