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I'm looking for something to add into my kelp meal fertilizer that can be used in water so that I can just hook my siphon mixer up to the sprinkler. The kelp meal is 1-0-2 so I just need something to supplement for phosphorous. What could I use?

google, liquid bone meal

Can the dry stuff be mixed with water?

This is information from the University of Minnesota, Extension.

Should I Use Liquid or Dry? The utilization of P by plants is not affected by the liquid or dry property of the fertilizer. Plant nutrient use in both liquid and dry fertilizers is affected by such factors as method of application, crop and root growth characteristics, soil test levels, and climatic conditions. The amount of water in a fluid fertilizer is insignificant compared to the water already present in the soils. Therefore, P in liquid P sources is not more available than P in dry materials—even in a dry year. The selection of a liquid or dry P source should be based on adaptation to the farmer's operation and economics.

To read the the rest on phosphorous go here
https://www.extension.umn.edu/distribution/cropsystems/dc6288.html

But can the dry stuff be mixed in water to be applied with my inline siphon? Nothing in that article about that.

no it can not.

you need to buy liquid bone meal.

Are you sure about that? I think I would try mixing with water then straining through 4 layers of cheesecloth so as not to clog anything.

https://www.acehardwareoutlet.com/productdetails.aspx?sku=7102627&source=GoogleBase

I've been using Rock Phosphate. Though I'm wondering what would bee a greener alternative once this bag is gone, since this is a mined product shipped from far away places.

One possibility I'm looking into is [url=https://www.earthworksboston.org/replicate/A_Grow_Fertilizer.htm]dynamic accumulators.[/url]