How to formulate tetrasodium EDTA and etidronate

Hi everyone am new here and into soap making.i would like to formulate with this

Palm oil
Coconut oil
Sodium chloride
Titanium dioxide
Tetrasodium etidronate
Sodium citrate
Tetrasodium EDTA

I have disodium EDTA and sodium hydroxide,its difficult to get tetrasodium EDTA and etidronate in my country. How can I use disodium and NaOH to formulate tetrasodium EDTA and what can I use for etidronate.
And in my country we have more of hard water than soft water, what measurement of the additive  can  i use for this formular in a bathing soap. Thank you


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