Ok,good news, after a lot of research I found the steam tables in excel which is a huge advance.
The next step, is multiple interpolation and equations... actually this lost me a lot because there's a lot of data trust me...
After this:
Steam tables spreadsheet
Interpolation program
Assumptions calculation program
Find best language (C, C++,Python,LUA...)
Nspire coding
Hope someone help me with all of that.